Sprint seat foam replacement

The seats on my car have become pretty uncomfortable.
Has anyone used the Aldridge seat foam kit? Or does anyone know the correct thickness and grade of foam to use?
Iain

I refurbished the base of the seats on my late Plus 2 using Aldridge 2 part pre-moulded seat foam and Newton Commercial rubber base diaphragm.

Interesting,. I didn’t know they sold the foam, too. Will be following.

I made my seats very comfortable by installing thin, dense material over the springs and under the foam. The material I used is intended for use under gym equipment to protect the floor. The material I used is 3/16" thick I recall. It prevents the springs from "imprinting’ through the foam. Several times I have driven for 500 miles with a stop for fuel only and my co-driver and I were ready for another few hundred-very comfortable!