Seems to be the right part number, at least for my 87.
Yes, I've seen that number all over the place - in this forum and elsewhere. I got the WIX from one of my local car parts stores.
make sure all the parts are where they are supposed to be.
Make sure the cover o-ring is in the cover groove.
Make sure the bolt o-ring is seating into the cover.
Yep, thanks for the suggestions, I've checked all that.
When I look at the top and bottom metal end caps, they are the same distance apart as the on previous one (a Kawi) but the stamped recesses in the center are not as deep. Also the rubber seals are slightly thicker, adding insult to injury. There's a good 3/16ths difference in the height between the seal faces - about 3/32 each side, as far as I can measure.
Oh well, I suppose it's off to Walmart to see if I can find something else. I gotta get the bike back on the road tomorrow to take me back down to Rockford (where it will sit, probably, till I can sell it.)