Interesting thread, having spent a few hours looking at how I'm going to fit my new tank in place. My ex racer had a bag tank fitted and was mounted on an ally frame. Going back to a standard size/layout tank, I need understand how they were originally fitted.
Do the two "planks" only bolt through the chassis side rails or was there also a cross rail that it bolted to along its front edge? (just as there is on its rear edge)