custom exhaust

Ok, here's my problem. I am getting custom exhaust made to exit through my Borla side exhaust skirts. It will be SpinTech Pro Streets. After the muffler, the exhaust will make a 90 degree bend and exit through the side skirt. The problem I have is I need a tip that has a 2.5" inlet and has either an oval or a dual tip that will fit through the holes in the side skirt.
the hole is roughly 6"x2.5". I have been searching the entire internet for days upon days looking for a tip that would work, with no luck. Does anybody know of any that would work?

I sent the seller a question telling him my situation, and asked if he would sell just the tips or could order me just the tips. I would just get the system he is selling but I guarantee it will not be loud enough for my taste, it is also a bit pricey, considering I already have the side skirts (and mine say "SVO" not the generic plain ones like he has, ).