Welcome to Vacuumland! Here is a list of the colors of Model B-8 triple-brush floor machines by years of manufacture. Available attachments: brown scrubbing brushes, green (or taupe) scrubbing pads, white buffing pads, and black shampoo brushes. Electrolux Corporation, now known as Aerus LLC, has always color-coded its household line of products (except for the ivory Model L), so in case you're interested I have included the matching vacuum cleaners--automatic and manual, respectively:
1965-66: Aquamarine Green (aka Aqua); Model G, Model L (ivory)
1966-68: Tan; Model G, Model L
1968-74: Teal; Model 1205, Model L
1974-79: Gold; Model 1205/Jubilee, Model 1401/Super J, Model L
1979-82: Brown; Model 1401, 1401B, 1505/Olympia One, Model 1453/Deluxe Special
1982-85: Gray; Model 1505/Silverado, Model 1453/Deluxe Special
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Moreover, other companies made twin brush machines with metal housing back in the day which may work better for you if you have smaller quarters. Following is a list of some brands with partial model lists due to more limited available data:
HOOVER (various colors):
Floor Polishers: 1940s (Models 0211, 0212); 1960s (Model 5000s, 5100s & 5300s—Mickey Mouse-style, 5450s)
Floor-A-Matic (w/pick-up): Models 3600, 3610, 3614, 3616, F5019, and others
Shampoo-Polishers: Models 5240, 5460, 5471, 5477, Model 5479, 5480, 5486, 5488, 5488-01, 5488, 5498
EUREKA Model 10
GENERAL ELECTRIC/PREMIER: Models FP-1, FP-2, FP-3, et cetera
SHETLAND
In addition KIRBY made polished aluminum nozzle attachments with special polishing brush rolls named:
"Floor Polisher" 1947-70
"Miracle Head" 1970-80
Also, S. C. JOHNSON made machines with polishing brush rolls and single disc brushes. Model prefixes for the latter include RP & HP followed by two digits that marked the production years.
If your purchase can wait I'd recommend checking out your local thrift stores and garage sales for the best potential pricing. You may also want to do some research beforehand to learn about parts availability. Online searches for "vintage floor polisher" will provide information.
Best wishes.