Using IKEA Skorva bed supports and hardware with US Cargo Controls L Track stud brackets and cut down 3/8 fine thread by I inch bolts, nylon washers and lock washers, this project came together. I estimate just over $100 in hardware costs and retained existing sprinter van L Track.

https://www.ikea.com/us/en/p/skorva-c...

IKEA Part # 116791 - Mounting Plates - 2 Pack https://www.amazon.com/dp/B076CWPCDC/...

US Cargo Control L Track Double Stud Fitting with Bolt Thread - Use with L Track Rails in Your Truck Or Trailer to Create Instant Tie-Down Anchor Points - Working Load Limit of 1,333 Pounds - 4 Pack https://www.amazon.com/dp/B07W8ZXHYB/...