Likely on the inside (rear side) of the rad cradle, somewhere close to the driver's side headlights. That's where most of the 60's GM's are.
Mines not, it's on the passenger side next to the regulator......hahahahaha!....just being silly.....
__________________
cutting a roof off a four door is NOT a convertible.....
65 Parisienne convertible.one of 49 built for RHD export market,402BBC, T400, 2500 stally, posi rear, upgraded brakes with front discs, FUEL FAST efi custom built by me.