TRIDON / NOVITA LL525 Electro-Mechanical Flasher - 2 pins - 6v ~$14

TRIDON / NOVITA LL535 Electro-Mechanical Flasher - 3 pins - 6v ~$16

Both should work on positive/negative ground.

Neither will work with LED bulbs, unless you use a load resistor.

Does anyone have a lead on load resistors?

I think I have already bought some - if this works?
Would 1 on each side do the job, or, do I need 2 on each side?