Well I've measured from the centre of the bolt to the rim and its about 58mm-60mm, it's a frame from the late 60's early 70's (Garlatti). The shop I speak of is Urbane, but the R556's they sell are recessed allen nut versions, whereas I need the classic nutted long-bolt version. I guess I may just have to suck it up and order the $72 Tektro's from VO if the SNG calipers are super cheapo. The frame I am building on is too nice to put really cheap parts on. If the SNG's weren't terrible I might have just gone with those to save the hassle of long/expensive shipping from international sites. Thanks guys and if anyone has further advice please fill me in!
Mark