Dave,
I have been looking around for this myself and have pretty much decided on the BSCI Dual Durometer Padding (your first reference or their website is
here). It looks like it is an excellent option and it's SFI 45.1 approved. I am ordering a couple of peices of it on Monday. I can give you a shout when it arrives if you want. Let me know.
By the way, did you get your fire system sorted out? I'm biting the bullet and ordering an FE36 system. I can always replace the tank...
Cheers