personaly I think thy look better without the PG:
But looking at photos i see they are not very big so I think you can buy any pickguard that is big and have someone here send you a pattern PG then cut one down to fit your bass. I did the same recently when making a Telecaster Thinline bass. The regular Tele PG would have covered the F-hole so i used a Pbass unit and cut it down to fit my need ( I had no pattern to work from )
Good luck on a very nice bass. I agree that the pearl PG looks nowhere near as nice a black or tort. If the CT & the very thin do in fact use the same guard ( as suggested by scuoco )it should be available to you. You would only need a can of Black paint to make it look good.
This is my idea of a good looking Hofner archtop:
here is a link for the hofner owners to get you started finding someone to make you a cardboard template to use as your pattern: Hofner-(not just Beatle Basses)-Group Part 2
Take care. Bob