Just be careful with the globes behind the lightning bolts Peter . They look and are the same size as 555 bulbs but they are not !! .. they are actually ( I think ) 618 ?? . The difference is that 555 bulbs are for 6 volt circuits but the circuits behind the lightning bolts are 12 volt flasher circuit .

The led flashers I used are I think 13.6 volt flashers are they ok?

Peter