Hi
Some pics of the fronts and rears of the pads on my Long Branch 4T. Hope they help - the inside of the rear is difficult to get a clear shot of given its position.
Do I take it that you'll be modifying a non 4T Long Branch? I'd have thought that LB No4's are rarer in the UKrelative to BSA and other makers so seem a shame to be building a 4T on an original LB?