My older book has both. A person will have to thumb through the sections and look for AR10 numbers or the like. The transmissions would be T96 or possibly the T86. Check Studebaker, Nash Rambler, and Kaiser Willys for application numbers. In the parts section, it should have R!0 numbers in there but they may be AR10 but look for anything with R10 in it. It should have something there for the late 1950s up into the early 60s. The T96 types likely all use the same type speedometer gears. If that doesn't pan out then call specific speedometer shops. The older the better. They're the ones that would know what fits what.
You might search old threads on here for any surviving folks that worked on the old model A conversions. There are few left that did this stuff but there has to be someone still out there that knows about them.