All the parts for the AC system I got from Rock Auto. The expansion valve and drier are pretty much universal parts for those years and also the O ring kit is universal. And yes I did convert the system to R134. I also downloaded the factory manual which has a very detailed section on the HVAC System on these cars. And always change the Valve Cores.
Parts I used rebuilding AC system
Drier- FOUR SEASONS 33575
Expansion Valve- FOUR SEASONS 39491
O Ring Kit- FOUR SEASONS 26764
AC compressor- click
I did have to put the pulley from my old compressor on to the new one since they where different sizes. The pulley is held on by about 6 little bolts