Here is a pic of the aluminum channel I found at my local metal scrap yard. If you can drill, tap, and chamfer aluminum, you can create a battery adapter like the Grin Bobs. When I found these pieces, the section on the right was perfectly fitted inside the piece on the left. Separated, they provide two different sizes of channel for different frame sizes. Section on left is about 1 5/8" wide and the one on the right is about 1 3/8" wide. Height is about 1/2" but they don't raise the height of the battery that much since they stradde the frame somewhat. I would guess additional height from using them is about 1/4".