MK II forks and Z1-R Are they the same double wall

DID MK II forks only come painted black? I bought a pair that were polished aluminum (marked) mkll and wondering if the were z1-r's. Triple trees did not have the steering lock and did have needle bearings.
Mainly I want to know if the tubes r double walled. I know the mkII are not sure about Z1-R'S