.Speedex tractors were made in Ravenna Ohio with a short run in Armstrong county PA shortly before the business vanished for good. The dealer network seems to have been primarily local so they're most concentrated in northeast Ohio and western PA.
You won't find new parts other than for components (engines, transmissions) that they bought rather than made. There is a moderately active facebook group with a couple guys that deal in used parts. Speedex Tractors | Facebook
Have joined the FB/ Group. Thanks MiCarl.