Looked into this a little bit more. As far as the foam, maybe this is an option, from JoAnn Fabrics:
http://www.joann.com/heavy-duty-foam-slab-1in-x-24in-x-90in/11178092.html#q=Foam&start=4
Also, I checked out the carpet that ACC sells. They claim to manufacture their carpet with "all factory padding included, including heel pads". The stock-interiors website does mention heel pads, but does
NOT mention the factory padding.
RockAuto sells carpet, made by ACC. However, there is a HUGE difference in price between Rock, and ACC direct. I wonder why that is? I have a couple theories:
#1. RockAuto buys in volume from ACC, and is able to trickle the savings down.
#2. OR, the carpets that ACC makes for RockAuto don't have all the bells and whistles, in order to meet RockAuto's pricing requirements (I'm sure they negotiate pricing).
The difference in price is significant. Buying straight from ACC, your looking at $339 plus shipping (cut-pile with mass). If you buy the ACC carpet from Rock, it is $155 (cut-pile with mass)
Is this an example of you get what you pay for? I don't know. I was going to purchase through stock-interiors myself, but now I'm going through Rock, or through ACC directly. I will need to email Rock to make sure that their carpet has all that padding that ACC's website claims.