Lennox air conditioner capacitor and compressor ohm readings
I went through the Lennox web site to find a "store" near me and found an actual Lennox service center. They confirmed the 5/45 uf 440v dual run capacitor was correct. They didn't have any specs on the compressor coil resistance. 

The service center didn't have any caps in stock but I found one at a local electrical supply house for under $10. It can also be ordered from Home Depot online (not available in stores) for about the same price. 

I checked the resistance from each compressor terminal to ground (29-30 meg ohm each), re-checked the coil resistances (no change), put in the new cap, and turned it on.  I noticed the current draw is lower than expected (9.2A @ startup, 8.9A running @ 230V supply vs. 15.4A nameplate) but It's working fine so far.