Broken Quarterlight Catch - Repair Question

[Veryvw]

Hi to any Technical Wizards.. I need a bit of technical guidance please.

Ok so my early bay cab Quarterlight catches are broken..
.... i.e the knobs popped off

I have the new part and know I need to drill out the rivets at the bottom of the Quarterlight frame and it should slide out.. Once I've got the new one in..

DOES ANYONE KNOW WHAT SIZE RIVETS I need to use to fix it back up?

Hope you can help
Thanks

 

[Trikky2]

This should sort it

https://www.vwheritage.com/search/?act=search.searchResults&sType=quick&maxDisplayRows=15&searchText=Quarter+light+rivet&btnSearch=" onclick="window.open(this.href);return false;