For an R11 relay you can pick up a small cube type instead of the more expensive OD item. Except for having the built in fuse the function is identical. You would need to add an inline fuse if you chose to use the cube style in place of the real thing.
Another poster said pre 68 VW headlight relays available at some parts stores are 6v and 30 amp contacts. When repairing the OD relay on his car he was able to get a Bosch 0332204001 and gut his old R11 relay can to hide the new inside. In his case he was able to reuse the original fuse holder on the outside. As expensive and scarce as they are, obviously you wouldn't want to gut an R9 relay but hiding the cube type is not difficult if you don't have the proper can.
The Bosch relays may be more expensive but Newark has a different mfg and the same style for around $6.50 per relay. They have a couple with tab type terminals which would be suitable and not be a hard swap. You could even buy one for the OD and a couple extra for headlights or something else for a single shipping charge.
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