that's good feedback guys -
I have purchased one of the York and Towne lock sets thinking that very thing, although the locks are similar the key cut is completely different, taking it a step further I found a mint Eagle key 'blank' that I was going to file and cut my own but the diameter of the hole is different (smaller) to those of the York center post and therefore will not work.
I have taken the box to a couple of local locksmiths and they look at them like a deer looking into headlights, I have emailed several locksmiths around the Country looking for the "B2" and "B3" keys (as stamped on the locks) and none seem to have a cross reference to what that key cut is or looks like. One 'smith said "just get a B52 key, that should work...." well, it didn't!
There seems to be no data on what the keys look like or what the cut is, thus my posting here. Surely someone must have fought this very issue in the past.