Since I have to do some work on my front end and pay for an alignment anyway, I thought I'd take this opportunity to replace the rubber K-frame isolators on my '78.

Firm Feel has the aluminum copies of the old Chrysler offering that are probably the best option.

http://www.firmfeel.com/b_body_late_mopar_sub_frame_isolators.html

However, for less than 1/4 the price, these polyurethane mounts are available.

https://www.summitracing.com/parts/ptp-4-101-bl

My question: Will the difference in performance be night-and-day, or will both be a marked improvement over stock with little difference between the two? I will spend the $250 if the difference is great, but I'd hate to if I'd never notice the difference.

One last question: Does anyone besides Firm Feel make metal copies of the old Chrysler solid metal bushings?

Thanks.