Hey, i've got a green middleburn one, and 2 srp, 1 black 1 silver, and they're all the same length i.e. too bloody long! they were intended for my xt 737 and lx 563 mechs but both seem to need shorter bolt.
was it the blue one on ebay by any chance? if so i can't help with blue replacement, but if it's not blue i'd be interested in a swap!
cheers,
chris