SDP/SI (Stock Drive Products/Sterling Instrument)
has gear stock from which you could turn any custom face width. (Other diameters available too.) Of course, their online ordering system continues to be horribly broken (and irreconcilable with their phone/mail ordering system), and their shipping to Canada is typically UPS with all of the associated brokerage fee headaches.
Linn Gear
also sells 20 pitch, 14.5° pressure angle gears, but they apparently don't have an online catalogue.