At some point years ago, my boat had some big blower motors in it, and different drives. Purely out of curiosity, I'm wondering what drives were on it, and I'm hoping someone recognizes the bolt pattern (the white circles are the old holes, filled with epoxy). Open holes are Bravo.

Probably a Standoff Box !!!

Makes sense! I haven't found any drive that has a pattern like that, but I didn't think about a standoff. Thanks!

Ext boxes use the same bolt pattern as the transom assembly

Yeah, that's what I'm seeing as I scour google images. Ah well, still a mystery, I guess.

Griff,

The bolts/studs go all the way through the extension boxes, correct? This is an assumption on my part, just thinking from an engineering standpoint....

Thanks. Brad.
(937)545-8991

The Ext box bolts to the transom just like a transom assembly would and the transom assembly bolts to the Ext box separately. Stelling Boxes have have 3 bolt holes for mounting to the transom to adjust the height as desired.