What are you guys using for your 90* elbow to TB connection

Right now I am using the rubber coupler that comes with the Trick Flow Elbow but it is starting to rip. I have to order some new t-bolt clamps because I had two seize up on me so I figured I would try and replace that coupler with a silicone one. Im just not sure what size to get Thanks

The one from the trick flow elbow to the throttle body I tried to find locally and couldn't. 4" was too big, and 3.5" was too small.

I'm using a 4" coupler from High-temp Silicone on my Trickflow w/ a 58mm TB and it works fine.