$86.00 at GM dealer for a new trans mount. Went to carquest and they said it was dealer only. O'Reilly has this one listed for 98-99 5.7 (Pioneer 622817) the box also says interchanges with 2817. It is $ 17.95 with a one year warranty. I really do not trust O'Reilly, they have given me wrong part numbers in the past. It appears to have the same heigth and distance from mounting hole to stud, but does look a little different. The Energy Suspension mount has too much vibration for me. For $17.95 I will try it.

 

What about the LM Performance one? Part # 10580? Has anyone tried this one?

 

I personally just went with an Energy Suspension Polyeurothane mount myself... hope this helps

 

I could not take the vibration from that solid mount anymore. The Pioneer mount is smooth and quiet so I can "feel" the car again. Now I just need to see how long it lasts compared to the GM mount.