The filter Eureka HEPA Dust Cup Filter DCF14/DCF10 is the correct filter for your Eureka Optima Upright Vacuum model # 437.
For use on 430 series lightweight uprights. For optimum performance, make sure to change your filter at least every 6 months. Eureka part # 62721B (replace part # 62731 & 62731a); because these part numbers can constantly change make sure to verify the correct filter by the label stating DCF14 or DCF10 or both.
Here is a link to our GoVacuum.com website so you can view and purchase the Eureka HEPA Dust Cup Filter DCF14/DCF10: http://www.govacuum.com/eureka-dcf10-dcf14-zvac-hepa-filters-62396-2-pack.html