"ZZZ" are filler digits for non US/Canadian car.
My car like any US/Canadian car, should have "ZZZ" on the trunk VIN but a VDS code on the others VIN locations, for digits 4, 5 & 6.
The chassis is build and VINed with "ZZZ" and when it's match to a US or Canadian order the other VIN digits; 4,5 & 6 (VDS Code) are defined accordingly.
In my case the VDS Code is "EA0":
E= Cabriolet/Targa
A= Engine for Canada
0= Active Restrain
Check page 44 of Porsche 911 Performance Handbook By Bruce Anderson, for the other VDS code defenition.
Porsche 911 Performance Handbook - Google Books
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83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats,
Going SOK Super Charger