There is no UCA, just a knuckle and LCA. $850 is crazy high for a ball joint replacement. Heres the ball joint im using. You press out the old one and press in these

https://www.amazon.com/Moog-K90493-Ball-Joint/dp/B000HPNVD6

Here's a link to the suspension setup and you can see even you buy everything new you still wouldnt get near $850

https://www.acuraoemparts.com/auto-.../acura/rsx-hatchback/type-s-trim/6-speed-manual-engine/chassis-cat/knuckle-scat

 

Thanks a lot for the great info, this helps a lot. This is the OEM part that needs to be purchased is that correct?

https://www.acuraoemparts.com/oem-p...SZhPWFjdXJhJm89cnN4LWhhdGNoYmFjayZ5PTIwMDMmdD10eXBlLXMmZT02LXNwZWVkLW1hbnVhbA==

 

Check this thread out:
http://forums.clubrsx.com/showthread.php?t=661610

Long story short, 05-06 balljoints are non-serviceable if you want OEM. You have to buy the whole knuckle ASSY. Hardrace & BuddyClub offer RCA balljoints for the 05-06 but they're not recommended if you're not lowered. Cheapest option is to go with Prelude balljoints which are a direct swap and readily available since 02-04 balljoints won't work with 05-06 knuckles. I hope this helps.

 

There is another way


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I had the same problem about 2 months ago I was replacing a front wheel hub system when I realized I should change out the old ball joint. I thought it would be a 40$ part but I realized you would have to purchase the whole lower arm assembly just to get the ball joint but through some crazy digging I found a thread that says you can use 1998 Honda prelude sh ball joints. And I can for sure confirm this I still have it and it still feels good no problems.


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Best part is only 18$


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eBay has the whole assembly for very cheap. I've always used the cheap stuff with zero issues. Usually the so called god stuff is the same, just in a nicer box.

 

http://forums.clubrsx.com/showthread.php?t=661610&page=2
That is the link for the thread these ball joints do fit they work just as good and they're super cheap at AutoZone just make sure you have a smaller castle but then the one they give you the only problem is it's a little tricky putting the cotter pin in with such a huge castle nut


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OP. What did you end up doing?

Your mechanic should be able to replace the OEM with an aftermarket ball joint. Your mechanic probably will not warrant the work due to the fact the ball joints are going to be marketed for a different chassis.

I used prelude compatible ball joints on my 06 type S without any issues. Ball joints can run you anywhere from 20 bucks to 100. Remember, you get what you pay for in some cases.
NAPA had 4 different ones to choose from. The premium ones were OE spec, while the cheapest ones had crap materials such as a cheap dust boot.

06 DC5 front knuckle with aftermarket balljoint by Corey Ganoom, on Flickr