You can mix and match as I did. I used Whiteline end links and sway bar bushings as I did not see that SuperPro offered them.Let's say I mix and match super pro and whiteline... which bushings will contribute the most to a harsh ride on 19" wheels? I'm getting the front strut mounts SPF1590AK already, but would sway bar bushings in whiteline poly contribute to a lot of harshness? I may need to get the car on the lift and get a deeper inspection on bushings so I don't order too many. Do you think we can identify all worn bushings or do some of them need to be identified after components are pulled off the car?
Sway bar bushings will not add any harshness.
Some parts can be identified as bad on the car (strut mounts, end links, ball joints, etc.). Others require some or full disassembly. I didn't know that my sway bar and radius rod bushings were fine until I pulled them off and closely inspected them. But I had already purchased the new parts so I installed them. In most cases, the aftermarket parts are an upgrade even if the stockers are good - the only exception perhaps being the sway bar bushings.