I can't give you a serial number because my engine is a mish mash of about three donors, but having investigated this a couple of tmes this might be the one I'm after......
The clamps have a slightly weird set of manual trim pin holes in that they curve in towards the transom, and the bottom one is ourtboard of the curve. The swivel has a stepped abutment so that if the pin was i nthe bottom hole although it would look truimmed further out the step is greater than the holes "out of alignmen" ., if that masde any sense?
The clamps seem to be cast for fitment, but not actually drilled & tapped for the moutning screws. It's one of these:
60 (3 CYL.) Mercury Outboard 9469200 THRU 9683054 Transom Bracket(Long Shaft S-N-0C160936 & Up) Diagram and Parts
But without the "keep up" lever. (Items 5 -10)
60 (3 CYL.) Mercury Outboard 9469200 THRU 9683054 Swivel Bracket(Long Shaft-S-N-0C160936 & Up) Diagram and Parts
I had worked out the hole for the lever might also double as the Trim sender on a PT application, but if not, no worries. (and I can drill / tap a hole if need be)
Any of you Merc Gurus able to shed light?