I’m looking for cross bars to sit across the tonneau cover which are compatible with Thule bike carriers. I have a Musso 2022.

These are the cross bars to suit a Mountain Top roller shutter on a Musso:
https://www.truckman.co.uk/mountain-top-cross-bars-to-fit-mt-roller-tonneau-musso-18-on-dc-8rtcrossssmu3