This has been discussed before but it is still not clear to me. I am looking for a c-record bottom bracket, italian threading which would be 111 mm to use with the c-record cranks. I have seen several available recently with slightly different markings.

70-SP and 70-SPc.

I understand that 70 is the Italian width and that S is strada and P is pista. The "c" is supposedly for corsa or c-record. So what is 70-SP? Is that a later designation? Is it for the early 90s Record crank (not for the c-record cranks)? Or are they exactly the same? Then there is the issue of finding the right cups and bearings.