Some of the spare parts that you can buy as replicas are such a poor fit that I didn't even install them…. Other spare parts simply don't exist…

Here is a list of parts that are now available for “self-printing”….

TR6 Lockable insert for the fuel filler neck: https://tr-freun.de/phpBB3/viewtopic.php?f=87&t=13492

TR6/TR4 Wiper-washer nozzles: https://www.thingiverse.com/thing:2988361

TR6 Air flap button '69-72: https://www.thingiverse.com/thing:3594980

Wheel Center Cap for Triumph: https://www.thingiverse.com/thing:1649218

Sunvisor bracket: https://www.thingiverse.com/thing:1652149

Triumph GT6 Door Handle: https://www.thingiverse.com/thing:2554527

Heater controls: https://www.thingiverse.com/thing:2739038

TR4 Air Vent Triumph https://www.thingiverse.com/thing:2974186

TR4 - Ashtray https://www.thingiverse.com/thing:3136675

lug-nut split-ring: https://www.thingiverse.com/thing:2995798

TR6 Glove Box Catch: https://www.thingiverse.com/thing:4556350

Spitfire MK1,2,3 Radio plate: https://www.thingiverse.com/thing:4568806

Spitfire Headlight Switch Retainer: https://www.thingiverse.com/thing:4573490

LED center tunnel lighting: https://www.thingiverse.com/thing:3609174

Update:

Triumph TR6 Window Winder Door Handle Pin Removal Shim tool https://www.thingiverse.com/thing:4767045

Triumph TR6 Glove Box Catch https://www.thingiverse.com/thing:4556350

Overdrive Shift Knob/Covers for Triumph, MGB, Leyland, others https://www.thingiverse.com/thing:5487854

Triumph GT6+ Mk2 Tail light Plinth https://www.thingiverse.com/thing:5458126

Stromberg 150 velocity stack https://www.thingiverse.com/thing:5462483

And tons of badges and other nonsense can also be found at Thingiverse….