I just got Home they are M3, the original one are line threaded, new one that comes with the new hardware are stars threaded. All the ones without thread are rivets.
I bought Tolex, but to be honest it is too soft at the touch, nothing bad on it, just different than the original one. I found this one in UK it is not for fourniture but for book covering, more paperish and AXA Lt same feeling that the old original one.