I picked up some crush washers, so I pulled the bolt (driver's side fuel rail) and determined that it is an M12 x 1.25 in case anybody ever needs to know.

Tapping the fuel rail on this engine would require removing a lot more stuff than I want to pull off right now and even then there doesn't look like there is much room for a fitting. Drilling out the banjo bolt might be a possibility. Picking one up from a junkyard is a good idea in case things don't work out.

Thanks for the replies. Anybody know a good source for crush washers?