Danny,
I'm interested in this too. Here's what I found.
Well after reading and searching high and low, I feel the old Polo rack and pinion units are the way to go for a Type 1 pan under a fiberglass buggy.
Now where does one find one.
Manufacturer VOLKSWAGEN
Number 867 419 065
Description Steering Gear
Cross numbers VOLKSWAGEN 867419065
TRW / KETNER JRM155
LIZARTE 02965700
AUDI 861419063B
AUDI 867419065
AUDI 871019065
GENERAL RICAMBI AU4001
DELCO REMY DSR366L
TRW / KETNER JRM155
FRIESEN QSR147