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Contact your local propane distributor. These kits are sort of universal.
The most common supplier is IMPCO. The systems consist of three basic components, a throttle body or throttle plate, a vapor generator and a Lockoff unit. The Lockoff is somewhat universal, and the vapor generator comes in several different sizes depending on horsepower rating. The throttle plate will be specific to the application.
I would just google IMPCO and go from there. IMPCO is used on industrial equipment, it could be that over the road vehicles commonly use some other system. Again, your local propane distributor can tell you everything you need to know.
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