Time to do it, rear seat and bed foam very tired.

What's the conclusion of those who have done it? I'm thinking 36-46 lb compression, around 2.5 lbs per cubic foot type foam.

And do I have it correct ( for the plain, not sculpted seats) that it's 4" thick foam all round? 

Not that interested in memory foam topper, just a plain old good quality foam.

Thanks

Alistair