Thread size for injector lines?

[addautomotive]

I want to get a big pile of the little plastic caps to put on the end of injectors & IPs. Basically, I'd just need to match the thread for the injector lines.

Anyone know what thread/pitch it is?

Better yet, anyone know of a good source for them-there little plastic  caps?

[commuter boy]

Local diesel shops will toss me a handful for free when I'm in getting seals and Standadyne.  Otherwise I'd try McMaster Carr.