Do they make a extension box for a trs.transom ass. Is a #3 speedmaster the same upper as a regular trs upper is their a trs speedmaster lower. Trying to find out what I would need to do box's and trs drives. Thanks JOHN SR

I have seen a few that people have made themselves. And a TRS and a #3 are different.

There was a company that made a box (I think Stelling?), but not for years.

There were some SSM II for sale on hear recently,same transom assy.as a TRS. Stellings made some TRS to bravo standoffs years ago,Might give you more options on your project. Not sure if Stellings made a TRS box. Hope this helps>