The best place for the clear turn signals is one of the discount BMW dealers like Pacific BMW or Circle BMW or Crevier BMW. Also independant resellers like Bekkers.com or Zagmunt.com or Maximillion Importing would offer these as well.
The wooden steering wheels came standard on 750's so you could try a recycling yard for one but other than this then you need to use the dealer or an OEM BMW parts importer like Maximillion Importing.
One final thought for you, if your car is getting new fender(s) then you could upgrade to the "facelift" healidhgts and turn signals that come on the 99 and later E38s. This is anice upgrade to the 95-98 cars that makes them appear more up to date. The fenders and headlights and the turn signal lights change to the new style, but they are not any different in price, so you could get this for the same repair cost as the replacement of the older look parts.
Good luck
John