Deutz
Deutz makes the air-cooled and water-cooled diesels inside compressors, gensets, rollers and tractors, and they are listed by engine model rather than by the machine around them: the D4506 to D7206, the F2L and F3L, and the 1011 and 2011 series. Starter motors and alternators are matched to the engine model in the Machinery Parts Finder on PartsForMachines, with the price on every listing. Deutz-Fahr tractors have a page of their own.
Deutz engine starters and alternators: D4507, D5207, F3L, 1011, 2011
Starter motors and alternators are listed against the Deutz engine model with OE number and voltage on the listing.
Read the engine model off the block plate; the air-cooled units carry F-series codes, F2L, F3L, F4L. The Machinery Parts Finder is the route: Deutz, the engine model from the dropdown, then starter or alternator. A Deutz or supplier number goes into the header search. Plate worn, photo to 07754288583 on WhatsApp. The Compatible tab confirms.
Air-cooled engines are oil-critical, so oil to the Deutz grade through the Oil Finder and filters head the wider range, then batteries and the rest by specification. Engine model not in the Finder? Ask Simon.