I’m making custom trailing arms for my 1972 Riviera because there is no after market. I want to include sway bar provisions. Does anyone know the measurements for the holes that I should add in the lower arms? For example, the distance from the rear mounting bolt to the first and second holes of the sway bar mount, and the bolt size. If anyone knows these dimensions for a Riviera GS, that would be ideal. But if not, dimensions for another ‘72 with after market sway bars available would be very useful. Thank you so much!
I found one version of the answer in a Summit review of a '71 El Camino rear sway bar that looks similar to the Buick bars: "...my 71 SS El Camino... There are two bolts on each side. Bolt spacing from center of the rear lower trailing arm bolt hole is 5" and 11"; if I cant track down a more Buick-centric answer I will use these measurements. However, unlike many cars including the Elky, the '72 Riviera has the shock brackets located interior of the trailing arms, so there isn't room for a sway bar in this location. Is the '72-72 Riviera GS rear sway bar supposed to mount from below instead of from the side, like shown in the images below? El Camino: '71 Riv (is this the stock location on a Riviera GS?)
Something to consider is that there were full-sized '71-'76 Pontiacs (cCtalinas & Bonnevilles) equipped with rear sway bars and boxed lower rear control arms. Does your Rivi have the same rear geometry as those?
