Hey,Steve! Glad to see you're making some progress. My'55 2nd-Series didn't use a clamp plate. That's probably why they were 10-lug. My friend's '59 viking 60 bus,uses both flanged,(outside),and Marsden,(inside),and a clamp ring,but his are 6-lug wheels. Passenger-side lugs are right-hand thread,as well.Please keep us posted on your progress!