Belt for a Eureka model 1279, or 1289 Rotomatic Vibragroomer I

[vacerator]

Hello , what is the correct belt? I have two sizes from a decade old purchase. No bag, The smaller belt has the number 115 on it. It doesn't fit. Too small. Does the Express style power nozzle take the same belt? I know they have the silver dots.
Thanks in advance.