Interesting. At least the dog ear plates are still available for $25 on that website.
Drexler is the company that still makes 168mm clutches, according to Diffsonline.
That is true that they are ZF differentials. However, it is mainly the 188mm differential that is documented. I'm not sure which Porsches used 168mm differentials. So, I think it will be a bit difficult trying to chase down the part numbers for them. I certainly don't know enough and don't have the bank account to do so.
I sometimes wonder if I'm fighting a losing battle modifying my 318ti. It won't ever be competitive in STX and I don't know how much more I have to sink in before I'm happy with where it is at. __________________ 
2000 M5 -> 1996 318ti -> 1997 328i 
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