Hello, i've got a 1998/99 p7 frame [the orange powder coated one] and i can't seem to find a front mech that fits the seat tube. 31.8 is too small and 34.9 is too big! What did they use on these frames? was it a bottom bracket mounted mech or some kind of weird diameter clamp? I'd rather get a mech that fits than attempt shimmage. Can anyone help?