Yeah the type is E-HCR32, where E stands for petrol, and HCR32 is the model type.
I've posted another thread about decrypting the VIN plate (which my other research project - related to determine why I have such pissy brakes)
Might check out the availability of 4 pots on Silvia's - almost all have 4 stud wheels which means the rotors wont go on my 5 stud hubs.
The car if defintely M spec from the model spec, but also it has a std GTSt steering wheel, not the snazzy M spec wheel. So it seems the car is a factory M spec with a couple of downgraded options.
Maybe the original buyer didn't quite have enough money, and had to deoption the car.....maybe I'll never find out.
Thanks for the caliper tip though, I'll let you know what I find out
KRCR32RGFSM AA
RC = rwd, R = M spec, 32 =R32, GF=manual (that's about all that is confirmed at this point)