[bestgenman]

Steve, that is so true.  I ordered 90mm Hella xenon low beams and thought it was going to be plug and play, not so.  Upon removing mine, I found they were 120mm.  Some model years had 120mm fixtures and later models changed to 90mm, I don't know where that break point is therefore a part number in this case would not have been helpful.  Additionally, I'm using xenon whereas Mr. Frantz may have halogen.  

For those wanting xenon 90mm Hella fixtures, here is the part number:  68139B  But beware, the ballast requires a special connector unavailable online, that i have found in quantities less than 20.  I'm still waiting on my 20 connectors.

As you can see from the picture, bracketry must be fabricated to accommodate the 120mm mounting in the 2000 model year. 
   

The tube molded into the front cap is 100mm.  This require a 100mm to 90mm bushing which i'll turn out of a 4" piece of virgin teflon.

Thank you Steve, for pointing that out.  I hope somebody else can benefit from this info.