I got the one from UMM Usa that has a smooth side on it.  I measure the holes using a caliper then find where it matches up on jig and put a couple of pencil makes thrn bend as many ad I need.  One cut to ho scale sizes would be extremely helpful though.

http://umm-usa.com/onlinestore/product_info.php?cPath=21_225&products_id=6597

Scott McDonald