Word of caution/in need of help- pack and play

So I borrowed a Pack and Play from a friend and wanted to wash it so it was clean for baby. Read multiple pages about soaking it in the bathtub with detergent, vinegar and baking soda. Sounded great!

Well... what they didn’t say is that SOME OF THE MATS ARE MADE OF PARTICLE BOARD AND WILL GET RUINED IF YOU SOAK THEM.

I now have a mushy, gross, dirty, not safe floor mat for the pack and play.

Help- does anyone know how to buy just this part? I want to save money, but obviously have to replace it for my friend and need the piece if I’m going to use it too. I can buy a whole new pack and play if I have to, but that seems silly for one piece.