If you pic one up, make sure to get all of the fittings. The hoses can be removed with some effort (and care) and replaced.
http://cgi.ebay.com/ebaymotors/85-GS550-GS-550-GS550ES-OIL-COOLER-5A37_W0QQitemZ230239712392QQcmdZViewItem?_trksid=p 4506.m20.l1116
If you go total after market you see that the price of the fittings can go skyhigh real quick.
I called paragon and got new SS lines, simulated fitting/clams and high heat coverings for about $80. The two upper mounting holes match right up with the frame on my GS1100ED.
On the recent trip, my bike GS1100ED stayed below 280 deg (as per the gauge) and we rode pretty hard. It was 115 deg and 50% humidity going through Indiokern on 395 (near Death Valley CA).
Posplayr
Update: Related Link on coolers.

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