Car seat anchors for 997 Cab
 

I just bought a Sunshine Radian 65 for the rear seat for my 997 cab. This was replacing a Britax Boulevard. The Britax Boulevard's base fits well. However it also adds a lot of height and my daughter ended up losing a lot of leg room.

However, the Sunshine does not secure very well. The seat belts route at a much lower point and only horizontally, making the upper half insecure leaving a lot of wiggle on the upper part of the seat.

I'm looking at options to bolt anchor points, etc. Anyone have suggestions?

What parts would fit and where can I find them? Also where can I attach them?

Also has anyone else been successful with the Radian in the back seat of a cab? I've read of anchor points in a coupe that are under the carpet.