They are supplied open ended as all apertures seem to vary in length. The seal can therefore be cut to the exact length required.
For best results we recommend gluing the seal to the glass and frame with windscreen sealant. This should also be used to attach the two ends of the seal where they meet.

We still have some silicone rubber seals which are cut to length. They are not moulded to go around the corners of the glass. This means that a little patience will be needed to seat the seal in the corners. These are sold much cheaper than the rubber parts. Please enquire.