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I thought someone would have been able to measure one for you by now.
At the moment the best I can offer to help you is deciphering the Yamaha part number.
Using information from this site http://xs1100.com/help.php#q04 scroll down a bit.
I make it 25 ID,28 OD x 6mm long.
Are these measurements plausible?
Looking at the part on Boats.net ( 1977 XS 650 D) it looks about right.