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If your seals are shot you might want to get the whole arm shaft rebuilt kit. They're cheap enough, and bad seals can cause dirt to get in their and eat the shaft/cup up and get loose.
I've been in the automotive field for 30 + years, I 've never seen a seal for the UCA. Bushings & shafts, yes. Looking at the NPD catalog they show a non-oem style boot that goes over the end of the non-oem bushing but you need that bushing to use that boot.
jlg