Tom from SWISCO responded:
September 14, 2017
Unfortunately, Pella does not provide the 58-178 to us in any alternate lengths. That said, you can just butt the ends together, yes. As for replacing them, they should just push into the groove where the old ones install. I'm not sure why the old ones are tearing, they shouldn't be held in all that firmly. The original installers may have used adhesive. You could try using an awl to work out the old kerf.
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