C-5 Seat Problem
Safety Car
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From: Vancouver Washington
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Seems to be a very common issue with the C5. I've got some Word files that talk about the rocking seat issue - if you'd like a copy, PM me your e-mail address. 
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From: Waldorf MD
This kit has all the parts and special tools, a little pricey but works.
http://store.tkoperformance.com/c5seshkitpsl.html
http://store.tkoperformance.com/c5seshkitpsl.html
Cruising
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although I machined some UHMW in lieu of the nylon washers, that writeup was on the money.
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2022 C5 of the Year Finalist - Modified
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This kit has all the parts and special tools, a little pricey but works.
http://store.tkoperformance.com/c5seshkitpsl.html
http://store.tkoperformance.com/c5seshkitpsl.html
Safety Car
Joined: May 2004
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From: Madison Wi
You can also go to your local hardware store and buy the same materials for less than $5. Follow the excellent write up posted earlier and you should be able to fix it. Make sure you throw a blanket over your console and door sills so you don't scratch them when removing the seat and seat rails.
"Parts Required: 8 Nylon Washers total. 3/4" OD, 7/16" ID, 1/8" THICK. We got ours at ACE Hardware for $0.30 each. Our ACE part number for these washers was 59558K. You can also find suitable washers at True Value, and some other home improvement stores. I have also read on various forums that ACE part number NYXH will also work. Again, it's not the part number that is important, it's the dimensions of the washer, and even then, you'll be changing that slightly. You will also need some grease to repack the aluminum block during reassembly. We used some Mobil1 synthetic bearing grease. Use whatever you have. "