Spline for Crestline bow window installed late 90's

I need to rescreen aCrestline. Bow window but cannot find an exact replacement for the original stiff vinyl spline. Will your 59-250 spline work? Original spline measures .230" wide by .185" deep. The screening is fiberglass cloth. The spline channel measures .250" wide bt .220" deep. The aluminum frame is embossed with 3-98. The frame also has a single ink stamp of 20.03x48.59. I tried .175" spline unsuccessfully (too narrow). The spline is "U" shaped with the open face down in the spline groove. Thank you in advance for your help and advice