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That depends on whether it's a 513, 514 or 515. The 514 and 515 originally had red headlight and rug nozzle bumpers and, early on, black wheels. The new gray Alathon® wheels were introduced during the late run of the 515 and were used then on until the Sanitronic D-80.
[this post was last edited: 9/20/2015-12:09]