Help me find what part to order

[RoamingQuebecois]

Hello fellow skoolie people ! I recently just bought a partially converted 2006 International BlueBird skoolie, which currently has no side view mirrors. I already have the mirrors, but I need to order the arm assemblies to put them up. I found the website linked below, which has a parts catalogue for the mirrors (#32), but there are way too many arm assemblies and I can't figure out which one to order. Anyone knows which part to order to hold the side view mirrors? Thanks !

https://www.westernbus.com/documents