Just a thought, but I've used 2-part plastic epoxies for making parts in molds, as well as products like JB-Weld and PC7 and PC11 Epoxies. All seem to work fine, unless you're going for a specific interest. I probably wouldn't use either of those for suspension bushings, but I'd make spacers and adapters with them.
The only other thing that comes to mind with urethane epoxies is to pay attention to the Durometer rating of the finished product, or the "stiffness" of the cured urethane.
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