Got an older Aluminum boat...need a drain plug 5/8"

Where can I find a drain plug that is 5/8"? I found some live well plugs that size, anyone know if those will work?
go to an auto store....tell them you stripped your oil drain plug, they will give you those self tightening rubber ones. they should have that size.
Thanks!

Found some at Gander Mtn (FYI)