The Triumph Spitfire body and engine changed 3 times over 20 years of production. Early Triumph Spitfire 4 (4 cylinders) identified later as "mark 1,  were followed by the Spitfire 4 Mk2 (Mark 2) a bit more powerful. The first body modification happened on the Spitfire mark 3 which had its front bumper raised. In 1971 occured the last and most important design change.

Spitfire 4 (mk1)

The first Spitfire's grille is made of two halves like on the Triumph Herald.

Front wings followed by the small doors give a very nice side line to the Spiffire.

TRIUMPH lettering on the boot lid at close-up.

The Spifire 4 rear badge,Spitfire mark 1's official name.

From front view, no way to spot a difference with the Spitfire mark1.	The rear bumper will be made of 2 halves 'till the Spitfire mark 3.	Here is the unique Sptifire mk2 external difference : the rear badge.	Inside, you will identify a mark2 from the contrasting piping and the black dashboard.
The hood is still of the pack away type.	No matter which colour the car is, steel wheels are always painted white on Spitfires Mk1 to Mk3.	Mechanics access on the Triumph Spitfire is like no other.	The engine is fed by a pair of SU HS2 carburettors.

Spitfire mk 3 front end can be identified at first glance. The front bumper is raised at the grille level .	Steel wheels on Spitfire mk3 are usually painted white.	Triumph Herald and Spitfire share the same mechanical parts. But the final customers are not the same.The Spitfire is a single's Sports car while Herald is a family car than was available as a convertible.	Inside, nothing but the small wood board changed. Customers have to wait for the Spitfire Mark 4 to gain in ergonomics.
Headlamp stoneguards are not original, these are accessories.	If you like it, you can replace painted wire wheels with chrome plated ones.	A very sporty design. Even if the Spitfire's performances are modest, the very low driving position helps to feel the speed, at any speed.	A long bonnet, wire wheels, bullet mirror are '60s British sports cars traditional  appearance details.
A very nice Triumph colour :  "midnight blue".	The Triumph Spitfire Mk 3 back end is identical to previous versions.	If you do not like steel wheels nor wire wheels, Minilite wheels are a nice alternate option.	Instruments at close-up : this layout is similar on every Spitfire Mark 1 to 3. Central position prevent from clocks to be hidden by a too small Moto-Lita steering wheel.

A now rare original colour : Magenta.	Steel wheels are another change on the Spitfire mk4.	The new dashboard with modern heater controls. But still no glovebox !	You cannot be confused with another Spitfire version, the Spitfire IV badge is positioned on both front wings and on the bootlid.
Overall view of the Spitfire Mk4's engine bay.	This is an original Mk4 and 1500 hardtop.	The Spitfire redesign gives the car a modern appearance.	The front wing finisher deletion is obvious on this side view,

No aesthetical change on the Spitfire 1500, the difference is under the bonnet.	Since Spitfire mk4, the rear bumper is made of a single piece.	Stickers instead of metal badges.	Rear end identical to Triumph 2000, 2500 and Stag.
The British Leyland badge, as fitted on many BLC cars front wings from 1970.	The tank filler is located between tonneau and boot. For your seats and hood's sake do not overfill.	On this Spitfire, the Minilite wheels are painted anthracite.	For those who want wire wheels without the need to change the hubs, British car parts retailers sell these bolt-on wire wheels.
Here we have an accessory leather Moto-Lita steering wheel. The black houndstooth cloth seats are typical to this version.	This Spitfire 1500 is fitted with the beige houndstooth cloth seats. As interior is under restoration, you can see the petrol tank located behind the seats.	The European 1500 engine, with a pair of SU HS4 carburettors.	This Spitfire's hardtop seems to be an Apal production.
Apal is a Belgian company that produced fiberglass body elements, including hardtops for the Triumph Spitfire.	Unlike the original hardtop, Apal's has an integrated bootlid at the end of a "fastback" roof line.	It makes the Spitfire looks much more like a Triumph GT6.	Once painted, the car may be confused with a fixed head coupe.