"seal greige" was supreme there. There is seal greige light, medium, and dark. However, THAT base is not one of them. If you take the cleaner, (take it) to Home Depot, they can/will 'match' that color as close as possible.
The Hoover color names for that model are Pearl Gray, Deep Mist Gray, and Peacock Blue, if that would be of help. My paternal grandmother had that same model. It really is a good cleaner. Best of luck with the great paint matchup!