[Three Peaks]

I couldn't figure it out either so here is what I did-

I took some 12 guage steel strips about 1" wide and cut them to the length I needed to come flush with the bottom of the tank support. I twisted them cold so they would match up with the curved 3/4" tube at top and parrallel with the tank support at the bottom and welded the top to the 3/4" tube leaving them suspended. I drilled a 5/16" hole at the bottom of the strips to match holes in the tank support so I could remove it later if necessary.

I'm sure there are better ways, especially if you're using a stock style tank and supports but this worked for me and it's pretty darned solid when it is all bolted in place.
If you need pics of my home made remedy let me know and I'll take a couple and send them to you. - Bob