The 
Eureka Upright Belts Style RD, with the Eureka Part # of 52100A, are the correct belts for the Sanitaire model# SC886 vacuum cleaner. The Eureka Upright Belts Style RD, with the Eureka Part # of 52100A will also fit the Eureka Upright models/series 600, 1400, 1900, 2000, 2100, 4000, 6400, and 5000 (except the 5180, 5184 and 5188). Eureka Upright Belts Style RD, with the Eureka Part # of 52100A, will also fit the Sanitaire Upright vacuums models/series SC6484, SC600, SC800. 

Here is a link to our GoVacuum.com website so you can view and purchase the Eureka Upright Belts Style RD, with the Eureka Part # of 52100A: http://www.govacuum.com/eureka-upright-belts-style-rd-eureka-part-52100a.html