Hi John,
Yes they do, technically they are called a shrink ring.. suit 30mm shaft, but they measure about 4-5 thou undersize as they are a tight fit, normal deal was to use what Ford called an "oven fit", ie warm them up to houshold oven type temperatures, 'bout 150-175 would do it, and press on, preferably with an arbor press,
Dont use flame, they can get too hot and expand permanently,
Got one in my shed as a matter of fact,
cheers