4150 coil update: Put 350 miles on the Capo yesterday. Bike continues to run well. I'm now looking for a single 4150 to carry as a spare. Thanks again to Raven for kickstarting this thread!
Re. the Sicma connectors... the ONLY place I could find them (that will sell in small quantities) is DeyTrade (www.automotive-connectors.com). Pricing is reasonable and shipping was quick.