Need a Kenmore Whispertone vacuum owners manual mdl 116-2645088?

Does anyone know where I can obtain an owners manual for my Sears Kenmore Whispertone Cannister Vacuum with Powermate head?
Model # : 116 - 2645088. Serial # : 083800484.
It's an older model, 1990's? (not sure), gray, 4.5 amps, but is in excellent condition and works great with very strong suction. Or in lieu of an actual manual, is there a website I can go to to download a copy? I called sears.com and was told they are no longer available for purchase. Perhaps there is one manual that would cover the entire 116 series thru the years of manufacture?? Thank You, Mary