Hi Eric as far as I know the early long frame flyers that had the straight back crankcase used a different shaped undertray that had a tapering section into the bottom of the crankcase, I think the gearbox was set back a bit further, wether the rear mounts were any further back I don`t remember but as the rear clamps were moveable this would not be a problem, but the early trays did not have the large hollow bolts at the back like the post war/ Brum trays, so if you see a tray with 3/8″ holes at the back it wont be any good for a Brum Scott. Alan Noakes. scottworkshop@hotmail.co.uk
