Front Control arm bushing kits. 2 of em from Moog??? Which one?

[V6UnderPressure]

I have a list here that has part number K6177 and one that says K6421. The K6177 says Lower control arm bushing kit. The K6421 says problem solver bushing kit. Which one do I need or do I need both. I think the 6421 is poly or a performance option but I am not sure. I just want to get what I need. The same goes for the Upper control arm bushing kits. The first is K6176 and the problem solver is K6411. Anyone have any clue? Thanks

Scott

 

[V6UnderPressure]

 

[Red Regal T]

Seems to me if you don't have some special problem (whatever they're talking about ), just get the regular ones.......or go to a different store. I replaced uppers not long ago and wasn't given a choice.