I would just check any of the big box stores (Lowe’s, Home Depot) for rubber mats in their flooring section and make my own. Something like this? You don’t want to know how much they’d charge you for the factory runner.
Ken and Terry
2018 Sunseeker 2430S with Trekker cap
and only rarely pushed by our 2017 GMC Terrain toad (4 wheels down)
Former Georgetown 330TS owner for 10 years with more mods than I can count.