All new face mills of the size you are looking for seem to be 22mm bore (Metric, of course).
What size shank are you using? 3MT? If so, have a look at eBay 191746712684
Dave
The Emerald Isle
ps – or can you machine your arbor from 1" down to 22mm?
Edited By steamdave on 05/12/2015 00:10:05