I received my new latches today ($49.08 USD total to my door) and installed them in about 30 minutes. Cool beans!
I didn't want to damage the old, serviceable lightweight latches by drilling the rivets, so used my Dremell with a cutoff wheel to simply remove the end of the rivet on the inside. So... anyone want a working set of latches w/one key for free?
I'm not sure what size Allan wrench the new latches' tiny hex-socket-head bolts took but found an unmarked one in my collection that worked... a 2mm? The tiny nylock nuts are 5.5mm. A 1/8" bit worked well for the new hole that has to be drilled for each new latch. As the old and new latches share one common bolt/rivet hole, once the old one is removed the new one can be installed with one bolt and the second hole drilled right through the new latch. Pop the second bolt in and you're done!
I'm a happy camper...
Edit: just looked at the site and they're now out of stock of the 94565 P/N.
John