I have a Diamond Back Ridge Runner II frame/fork/headset. It's from the mid 80s(maybe 84). It has braze-ons for everything, including lowrider, rack, and fender mounts. Has the original bi-plane fork. The only issue is a repair on the seat clamp area. One of the clamp lugs was re-welded. The repair looks fine, but will need a little touch up paint.

The frame looks just like this, but has brazed-on threads in the middle of the fork legs.



I'd be open to something similar in at least a 23" frame(24 or 25 even)

Seat tube - 47cm (center to top of top tube, or 50cm center to top of seat tube)
Top tube - 55.75cm (c-c)