vintage regulator

Hello, I bought a Scubapro 156 and 108 HP with an Mk10 in great condition all serviced ready to go... can’t wait to try them. I was wondering originally what first stage did the 156 come with? Thanks, Kevin

Trying to locate the service manual for a Spiro Pioneer YOKE first stage. No luck at vintagedoublehose or frogkick. Best I could find is the parts description at www.spiro-vintage.com but I was hoping someone out there would have access to the full service manual. Thanks in advance. Jordi