I need to know the size of the rear left one, replacing the mount and found someone put the wrong bolt in.
2006 Honda Civic si coupe, Need to know the bolt size of the left rear trans mount bolt, thanks in advance

 

I am fairly certain a stud and nut go in that location.

https://www.hondapartsnow.com/parts-...unts_2_0l.html

https://www.hondapartsnow.com/parts-...case_2_0l.html

You can run a bolt in there, same as part 12 (90166-ST7-000) in the first link. Should be an M12x1.5 with a 64mm length.

Stud is 90380-S10-000
Nut is 90371-SEF-000

Beware you might be opening a can of worms. There is a reason the stud is missing.

 

I actually called Honda and they sent me a stud, but It wasn’t long enough to thread into it. But yeah hopefully I’m not opening a can or worms but guess I’ll find out..

 

The stud has a thick spot between the long side and short side that might not pass through the mount bracket.