Now available from Lovecitycycles are new replacement wingnuts for those missing ones on you rare Simplex narrow straight lever quick release skewers. Wingnuts come in both black or white…Brass insert nuts have been threaded to match the early M5 x .75, French threading, on the original wingnuts.
Sheldon Browns Technical Data Link
Best Technical data available on most 1970's and 1980's road bikes.
Seat Post sizes,
and lots of useful tips on bike repairs.