A friend at work who is big on old Datsuns found this and passed it along to me. It might not be ideal for those of us in the states, but at least they exist!
https://www.facebook.com/1019828981401739/posts/subaru-brumby-brat-owners-will-be-pleased-to-know-that-we-have-brand-new-tailgat/2562631333788155/