VCCA Home Forums TECHNICAL - 1945 AND NEWER 1949-1954 Rubber/seals for sliding quarter window 1950 coupe

I'm in the process of getting the stuff to install my rear sliding quarter windows. When I pulled them out there was really nothing for me take photo so I need help. Below is listed two things by Chevs of the 40's.
**The first one below seems to be a kit, or everything I think I'd need to install them at $66.25 a set.
**The second one says just Vertical Rubber for front of glass for $78.75

Question: what am I missing here? The first one list Vertical Rubber and is $66.......then the second one list Vertical Rubber by itself for $78.......(are both of these required?) someone help me out as I don't relish the thought of dealing with vendors over a mistake. I've had enough of that the past 30 yeas! I can probably figure it out but any additional comments about installation welcomed.....HELP

Vertical Rubber4114958 39^53
USD $66.25 Set
Chevrolet Parts - Quarter Glass, Vertical Rubber and Felt Seals Front Of Sliding Quarter Glass. Coupe and Sedan

CHEVROLET Quarter Glass, Vertical Rubber and Felt Seals Front Of Sliding Quarter Glass. Coupe and Sedan
These are the vertical rubber and felt seals for the front of the sliding quarter glass on coupes and sedans. Sold as a 4 piece set. For 1939 1940 1941 1942 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 Chevrolet Cars

4114959 39-53
USD $78.75 Pair
Parts - Vertical Rubber- Front Of Sliding Quarter Glass

Vertical Rubber- Front Of Sliding Quarter Glass
Vertical Rubber For 1939 1940 1941 1942 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 Cars

Ring, ring. Hello? Chevs of the 40s, how may I help you? My name is Alvin and I have a question...........

I hear you Tiny....this is way we have these forums though.

I have talked to one of what appears to be one of "vcca favorite vendors" and just gave up!
Besides, I really like to know what I'm talking about, before speaking to someone who may, or may not, know themselves
"because the other guy who does is on break or out to lunch"..
no vendor bashing here, just wanting some first hand info from someone who has "been there and done that" since mine had nothing. Hmmm, maybe i should hot rod it? just kidding, just kidding.