replacement rain stripping for Pella windows

I have a house full of 16 year-old Pella windows. The black rain stripping is deteriorating from around the casements. These are aluminum-clad wooden windows. The rain stripping is 5/8" wide with two 1/8" barbs along one edge (pictures attached).

I would like pricing for replacement stripping. We have 41 casements that need replacing, so please let me know what quantities of this you have available (I assume it comes in rolls).

Thanks!
MATT

I purchased the same 58-178 strip for the same replacement as pictured here. This new gray strip is a little bit wider than the original black ones, and consequently it shows along the edges of the casements a little bit, although it does not extend past the outside of the aluminum trim, and it is not so obtrusive that I opted to keep and use it.
it seems to be a good quality of product.