Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
for a 1972 CB500/4 K1 please:https://www.ebay.co.uk/itm/NEW-OEM-GENUINE-HONDA-MAIN-IGNITION-SWITCH-FORK-SEAT-LOCK-SET-W-KEYS-5046-301/181276851191?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2055119.m1438.l2649
Don't think the spring comes with the set of locks, there is also a cover and rivet to stop the lock falling out