J, The RC shops are my next stops. Its highly unlikely anyone makes a drop in replacement. I am hoping to find some gears with the correct profile that I can modify. If anyone else wants to help with the search the basic dimensions are as follows.
Small Gear, 13T, OD .410", width .132" with a .125" (1/8") center hole.
Large gear, 19T, OD .576", width .132" with a .125" center hole.
Number of teeth and OD are the most important. If its wider or has a smaller or no center hole then it could be machined to fit. Anodized aluminum or mild steel preferable, also delrin. Less desirable stainless steel or brass.
Don't ask me about pressure angles or mods. A real "gearhead" ME would help here.
Pete