front diff seal

Moderators please sticky this post. Look at # 38 on the list below the map.... Http://parts.nalleygmc.com/products/GMC/2004/ENVOY-4WDXL/SEAL-Front-Axle-Front-Wheel-Drive-Axle-Shaft/2631191/12471618.html I looked all day for this part, parts4chevys .com either doesnt have it or I couldnt find...