You could also get some machined out of delrin. It's a hard plastic polymer made by dupont that is similar to Nylon. It's been used very successfully in the Mustang Cobra IRS to help control wheel hop. It's hard enough that it doesn't deflect and unload like the stock rubber bushings.


Or you could get some heim joint ends welded into some tubular stock.

You mentioned uppers and lowers... If you're still using the factory 4 link setup that if there's no deflection in the bushing that it will bind.