Keep in mind that the webbing length does not determine the hipbelt fit, if you are a 46 waist you're going to need to look at pack companies that cater to that - and there won't be many. You really need that foam coming around the hip and when that buckle is tightened ideally you don't want more than 2 inches of webbing on either side.
ULA Circuit and Catalyst offer XL and XXL hipbelts, you can also get longer shoulder straps sewn on.
https://www.ula-equipment.com/product/circuit/
I also have a Granite Gear pack and their adjustable belt will not work on a 46 inch waist.