I have a few feet of the original (unused) weatherstripping. It has a 0.250" tall pile and base. The well used stuff in the windows is 0.225" tall, but it's spread out from use. The attached image IMG_0614 is of the virgin stripping. The other two are of the well used stripping. The width of the base measures to be 0.268" wide (17/64").
I tried some with a 0.219" height found at Home Depot, but it was too short to span the space. So the pile must be taller than 0.219" (7/32").So I seem to need 17/64" x 1/4". I'd guess I could get by with a base slightly narrower than 17/64", maybe 0.250".