Need polyurethane motor/trans mounts, which ones?

[Mrturner1]

I need to purchase motor mounts and a tranny mount on a 1970 c10 SBC. I looked through all the vendors and couldn't find what I'm looking for, but I want to support our vendors. If I'm understanding correctly, polyurethane is the way to go for performance right? Stiffer than rubber? I wanted Energy Suspension mounts but couldn't find any vendors that carry them.

Here's my old ones for reference, because apparently there are two different types?