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Thanks for the add!!! Taken a few weeks ago along A1A near Deerfield Beach, FL My 1900 Convertible with 27K miles.

The GM part number for the Morse chain is 25530114. It has to do with the top surface of the chain where it rubs against the tensioner. The smoother and flatter the surface, the longer the tensioner will last, at least that is my belief. I have had poor luck with the standard Cloyes replacement. The chain is the important part and the sprockets can be something else if desired. I am not fond of the new style replacement tensioner design either because of the relatively soft material and the limited thickness of the rubbing surface, but it seems there is little alternative.

That's a great photo. Looks like it should be on a calendar.