Powerflex exhaust mounts - which type?

When I bought my car it didn't have the original mounts and now they need replacing and I want to get some powerflex mounts to reduce movement.

The only issue I have is that the mounts on the car have that kind off mushroom bit on the end meaning you have to stretch the rubber mount over it to get it on. Now this is fine with rubber as it can stretch but the powerflex mount is never gonna stretch over it so wanted to know if anyone has replaced their mounts with powerflex ones and which type they purchased?