Its pretty typical to fasten the strap straight onto the beam. If you're particularly worried you can put a plastic shim between the two items, nylon bushes around the bolts and then coat everything with duralac.
If you don't run the striker through the beam you need a compression insert in the beam to transfer the load. This is a far more complicated installation.
Post on the F16 forum and ask what people are using as straps.
