the valve stem seal replacement on the MKIV's are pretty common - i'm getting ready to replace mine, myself. good thing yer turbo's arent bad!
I went through Jeff Watson at Champion Toyota to get my valve stem seals - however, i'm sure either him or Curt Aigner (Elmhurst Toyota) would be more than able to help you out. They both have a thread dedicated to their dealership here on the main forum, and are very knowledgeable and helpful folks. hope ya get them seals taken care of!
-jim