Jim Carter and others sell 47-55 Suburban rear side window installation parts and/or kit (channels for sliding windows, and the solid rubber seals for non-sliding windows, and the rectangular rubber lock strips).

Jim Carter Window Install Parts

The whiskers that go in the stainless-steel vertical bars are not so easy to find. Restoration Specialties & Supply, Inc. has whiskers that can be adapted to fit the Chevrolet suburban's vertical bars. However, information has been posted on the oldGMCtrucks.com site that indicates that Chevrolet Advance-Design suburbans had one vertical bar per pair of side windows but GMC New Design suburbans had two vertical bars per pair of side windows. The whiskers might be different.