Wheels & Tyres
As far as I know, the M Series cars came with two main wheel options:
T Slot Wheels
TVR had these wheels produced for the M Series. The name relates to the design - which incorporates 'T' shapes inside the cast spokes of the wheels, which were painted or enamelled black. The wheel was a polished alloy rim - whether originally lacquered I'm not sure. The alloy used for these wheels is prone to tarnishing, to be expected considering the age, and the rims are not easy to find in decent condition.
Wolfrace Slot Wheels
Wolfrace were a large manufacturer of custom wheels in the 1970's & 80's - and have since been re-introduced. The slot mag wheel was one of the most iconic sports car wheels of the 1970's.
2500 - This car I'm pretty sure had a different design of alloy wheel - have yet to get more info about these but the wheels have more "finned" type of spoke.
Pics & more info to follow soon.