Both napa and autozone list the master cylinder for an 85 monte as non-metric outputs. Further the 87 B-body and 87 S10 master cylinders of mine were both non-metric outputs. The bore sizes are metric, the mounting pattern is metric, but the outputs are regular old 45° SAE inverted flare fittings.
Originally Posted by NAPA
Item#: TS 101926
tax and shipping not included
Disclaimer: The stated price may vary from the in store price and may change at anytime.
Features & Benefits:100% OE Quality New Seals Are Installed On Every Unit. OE Performance And Reliability.
# of Line Ports:2
Brake Cylinder Bore Size:24mm
Line Thread Size:1/2-20
Originally Posted by AutoZone
Part Number: M1926
Weight: 3.25 lbs
Notes: - installer warning - unit must be bench bled. If you experience any installation problems, call toll free: USA 1-866-787-5132 can 1-800-293-0760
Reservoir: No Reservoir
Bore Size: 36Mm X 24Mm
Cylinder Honing: Never Honed
New Sleeved Bore: Yes
Special Installation Notes Included: Yes
Primary - Hole Size and Location: 1/2"-20 Fender Side
Secondary - Hole Size and Location: 9/16"-18 Fender Side