What lower driver side mount do i use that goes on the ac mount? 99 hb with 94 ls b16 tranny swap.

 

Use the one from the LS, unless you are keeping your a/c.

Then get the delsol vtec bracket.

Edit: I just reread. Are you wondering about the bracket, or the rubber mount?
Use the LS bracket and your stock civic rubber mount.

 

i kept my ac and i bought a del ac bracket already installed but i need to know which mount goes on the end of that ac bracket?

 

Just reuse your stock civic rubber mount.