You have to cut it to length-I put them around the glass & in the truck beforehand to get an idea of length. You want it as long as possible, but not too long. Does yours have a locking strip(small bead of rubber that goes inside the larger w/s)? If so, install into truck cab, then use a plastic glazing stick(bone)to work the glass into the w/s, then apply the locking strip-there's a tool made for this also, or use the bone & patience.
Alternately, you can install rubber on the glass(lockstrip & all), then using a rope in the w/s groove pull the rope from inside the cab to install.
small ones are easy
