I bought a six pack of 1/4' x 15 feet 3M butyl rope. Price was much better by the six pack.
I used this to install by rear glass.
Works well for just need to keep it toward the inside edge of the indentation on the body.
Retail price for one of these from NAPA is $28 plus shipping.
I figure at $25 per roll shipped you can easily get one roll to install a rear window.
If someone wants all three the price is $50 shipped.