Kolbe and Kolbe kerf bubble seals

My Kolbe and Kolbe crank out windows have a 1/4 in. bubble. the one you list is 5/16", will this work or cause a problem? Also is the spline of the seal ridged?

Thanks
Jeff

This is the bubble seal for Kolbe & kolbe casement windows I am trying to locate. This seal measures 1/4? O.D. With a 1/4? spline length and 1/8? width. The one you lost is 5/16 OD. Will that cause a problem?