As much as I'd like to make these a simple install, the fact is that these tanks don't just go right in. It's a lot of work. I've designed my own cross members to make things easier for us to install here but it still isn't easy enough that I'd feel comfortable selling them without a huge caveat...and that would be you'd pretty much be on your own for the rest of it. I've now done 5 installs (all EBs) and 1 coming up soon (RB). All different years, some gas, a diesel, V8s, V10s... Every single one has been different in some way. Whether it is the fuel line size, the sending unit, the evap canister and plumbing, etc, etc... No two vans have been the same. I couldn't tell you what fittings to buy, I can't say for sure what sending unit will work and depending on what type of hitch you have or evap canister, I can't even tell you specifically where to drill the holes for the cross members. I have to figure out each one on the fly. The relocation and venting for the emissions stuff is always a chore and requires custom brackets too. And if you want to do the fuel door like we do, there's a bunch of sheet metal work to do and fabrication of the filler tube. The extra fuel is great but it comes a cost.
The dies I made for the fuel door recess weren't that expensive. just shy of $400 to reproduce. If several people wanted to do it, a "community" set of dies can be made and passed around. Harbor Freight sells a hydraulic ram similar to what I use for drawing the dies together.
I can make the cross members, I can make the dies... I'm not going to have an all inclusive "kit" with step by step instructions though. An ambitious DIY'er can get these tanks installed but be prepared for some frustration and several ****** moments.