[We Gone]

Here ya go..did my 90 works good as long as the bags and fittings are good...This came from Corvette Forum under the C4 tips..

This tip provides additional information to the Tech Tip "FIXING YOUR C4 SPORT SEAT LUMBAR SUPPORT" authored by Bob Thibodeau on 6/15/2001. 1. An alternative source for material to replace the ruptured diaphragm is a bicycle inner tube. It is much thicker than the original diaphragm, and should provide longer "life". To prepare the tube, cut a square about 2" X 2". Locate the center of the square by intersecting the lines from each corner. This will provide the location for the center screw. If the screw is off center, you will develop a "rolling pulsation" , which is not as efficient as a "verical pulsation". 2. Using a compus placed at the center mark, draw a circle 11/4" in diameter. Cut out your circle precisely, and now you have your diaphragm replacement. 3. The pump is held in positon by three bolts. The heads of the bolts are located under the seat, and the nuts are recessed on the top, which requires removal from the under side of the seat. 4. When reinstalling the pump, it is recommended to replace the bolts with screws and self locking nuts. Installing the screws from the top will allow you to use a screw driver for ease of installation. I found that when using self locking nuts, only two were required to sufficiently fasten the pump to the seat. With the "inner tube" replacement diaphragm, I am able to compare pump production with the original diaphragm in the passenger seat. The inner tube diaphragm provides a more rapid inflation of the lumbar bladder.