Bb30zx, I will send you the file when I get to work Monday, the flanges use the stock 240 rubber mounts and bolt to the side of an RB26. then I cut up the angle to fit my jigs.
81na ZX, the RB26 I have is first and only RB block I have ever seen, but from what I hear all the RB blocks are the same...but dont quote me on that.
I just up loaded some photos on the Album you can see the mounts there. or on my link.