Rick,
I apologize if we were unclear at SEMA.
The Delrin bushings are designed as a direct replacement for our poly bushings. As such, any control arm that has a poly bushing will be changing to Delrin as soon as we can get everything changed over.
However, some of our control arms were designed to use the OE style rubber bushings. (especially control arms that use the OE cross shafts, like the 58-64 Impala, tri-5 Chevy, etc). The 65-70 B-Body uses rubber, but we make the cross shafts, so the change is easier. We just have to go through all the applications we have and re-design everything to fit the new bushings, then test fit them on a vehicle to make sure it all works. Since Delrin does not "move" it is very "dimension critical" to make it fit in the vehicle. I will not release a part that we "think" will fit. . .we have to know for sure.
Most applications will change. . .but some may need to retain the OE rubber bushing. For example, the 58-64 Impala uses an odd cross shaft that is "bent" in the middle to allow clearance for the steering shaft. Obviously these are much more "design intense" and will require more time.
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