The Electra used the same front and back wheels as the bigger Norton twins, I once purchased the remains of am Electra that the scrapyard employee had taken the wheels/forks off for his Dominator twin. I had a Navigator at the time with a erratic gearbox (only 3rd and top were reliable, good thing Norton clutches were robust!), and rebuilt it with the Electra crankcases and (later type) gearbox, using the Navigator barrels and heads.
The Electra chaincase, sprag drive and starter were sold off (sorry Steve!), as even then (mid 70's) they were sought after parts.
The 250 Jubilee twin had puny forks and wheels/Brakes, the Navigator retained the puny rear brake, but had roadholder forks and a 8" front brake, so I did not use the rear brake much.
The motor was also less oversquare (bore to stroke ratio) than the Jubilee, easier to set up and nicer to ride.