1.5” should do the upper and lower bushings on both GT and Manta.I rechecked the search and it was showing for a 3" diameter piece but you are right.
That place was high on all their stuff!
So a 1 1/2" diameter is large enough? Is that the same for the pan hard rod and stuff?
I'd crawl under the car and measure but it's to danged cold and there's snow on it right now.
I have several feet of 1" delrin rod. I use it to make spring guides and poppet valves for air guns.
Do not use Delrin on the rear suspension, all the joints articulate in multiple planes. Not only will Delrin bind up, it will eventually crack and fail.