For anyone wanting to convert the A body from 5x4 over to 5x4.5

New to MOPARS. I was reading this thread because I need to convert my '65 Barracuda 7.25 axle from SBP to BBP.

It's a budget build so I cannot afford to swap out for a 8.25 or 8.75 rear at this time.

I have a set of BBP wheels and tires for it. That's the reason for the conversion.

Wheel adapters made the tires rub, so that's a nogo. I'm thinking about redrilling the axle hubs using a drill guide:

Drill Guide - Hells Gate Hot Rods

But before I get the guide and start drilling, I was wondering if I can get these axles from Summit:

Nitro Gear & Axle AXC4348511 Nitro Gear and Axle Direct-Fit Axle Shafts | Summit Racing

Will they fit my early A body 7 1/4"? I don't know the stock number of splines or the length.

Thanks in advance!