www.ebay.com/itm/364620852632... here is the link to the flasher i used. There is also a dual flasher one.
For this project, you dont have to use the wood if you can find something else that will work. It's best not to be metal unless you insulate the two parts.To ensure they would create a short. I used red led bulbs, but that's not needed. You can use clear bulbs. The colored led give it a much richer color look but not needed.