I can see you have the low height 103 sight. This is actually for an earlier model 70 than your 1955. The sight you need is the later version of this same sight, which is about 1/8" taller.
By the way, you have a somewhat rare sight ramp. Normally, the backside of the ramp was stipled, as in the second ramp photo I posted. Yours has a cross-hatched pattern, which was only tried out experimentally between the stipled ramp and the multi-ridged ramp.
