Well I checked with Clausing - the shim is no longer available and no drawing is available. I found some 1/32 material n the shop and made a shim from that - as expected 1/32 was not enough so I doubled it up which allowed the holes to line up nicely.
In the process of solving this issue I also noticed that there was a 3/16 ga between this guard and where it bolts to the head stock. this was enough to allow the guard to flex when tightening the bolt. That made me nervous. I checked the parts diagram but there was no support block/shim in thst area. I decided it needed something so I found some 3/16 material in the shop with a clearance hole almost perfectly placed. So I hack sawed it to rough shape, dd some grinding and filing and painted it. It woks fine in terms of providing support behind the guard but I'm curious why that gap was there to brgin with. There is no adjustment that I can see - the head stock is locked in place via a locating pin and the gear box is locked in place by the mounting holes in the bed. I'm still not sure why the gap is there but until I discover a reason, I think the support block is the right way to go but am open to other's thoughts.
Rick