I would have put money on either Triumph Spitfire or MG Midget/Austin Healey Sprite, but looking at photos, it isn't any of those.
Knowing Chunky, I would expect they were from some early/mid 1960's British car which was mass produced so he could buy a few thousand on the cheap, just like he did with the bumpers, headlights, door locks, bonnet and boot hinges, door handles, electrical switches, etc.