The 038 and 038 Magnum had the Bing 47 carburetor. The early 064 AV had the Bing 48.
The 034, 036, 044, and 046 have all had Zama carbs at one time ( C3M ). Zama exclusively makes the carbs for the "Arctic" models, including the Arctic 026, except for the Arctic 066/660 which uses a Walbro carb that has a heating plate.
Early small Stihl saws like the 031, 020av, 020 Super, and 028 used the Tillotson HU models or a small Walbro WA.
Some early 090s and 090Gs also came with a Mikuni carb similar to a Tillotson HL. Some of the early 070s had a large Walbro that was similar.
If anyone knows where to get a carb kit for the Bing 48 that came on the early 064, let me know. The carb kit is listed as "NLA" for that model. The carb kit for the Bing 47 038 carburetor is still available but the parts do not mix and match between the two models, they're completely different animals.