Replace panels (with pre-cut grooves) in conservatory.

[Micke_xyz]

Some wooden panels on the sunroom have swollen and formed gaps where rain can get in.
I thought I could replace them with plywood, but now that I've pried one off, it has finished grooves that fit into masonite.

Is this the sunroom manufacturer's own panels or is it some standard that is available ready-made?

The alternative is to remove the protruding masonite and go with plywood, but that's unnecessary work if there are ready-made sheets available to buy.


Here you can see the masonite protruding that I might have to remove.