Transom Mount Bolt Size Merc Alpha 1 Gen 1 or are they studs.

[1985 Century Mustang]

I have to remove my transom mount on my 1985 Century 20' Boat. I'm redoing my whole transom. It's a Merc 1 gen 1. Does anyone know the bolt size or is it just a stud, I snapped one off hitting a sandbar last year, so I'll need to replace the transom mount and the bolts studs etc.

 

[Scott06]

I have to remove my transom mount on my 1985 Century 20' Boat. I'm redoing my whole transom. It's a Merc 1 gen 1. Does anyone know the bolt size or is it just a stud, I snapped one off hitting a sandbar last year, so I'll need to replace the transom mount and the bolts studs etc.

https://www.marineengine.com/parts/mercruiser-sterndrive-parts/rmralpha-one-transom-assembly-19831990/6216687-thru-0d469858/transom-plate-and-shift-cable

I think its #7 on there

7/16 coarse by 4.25"