I'm back with my dual 3.5" speaker brackets

I am interested. I was looking to fabricate something to hold a pair of 3 1/4-inch Infinity Kappa coaxials where the original speaker would go. Please send me more info. Also, does anyone know where I can find an early A-body speaker grill (60-62 Valiant/Lancer)? My project is a 62 Valiant 2-door hardtop.

Can you (or someone else who knows) confirm for me the distance between the two end mounting holes of the OEM speaker. Hopefully, it should be approximately 10-9/16".

Jerry