Go to an OEM repair parts website like Levittown and buy the parts there. I bought the GT500 brackets for about $60 each and two new rotors from Centric. I reused the pads and original calipers. I did it two years ago and it was about $250.
The Ford kit is just OEM stuff that's been substantially marked up. You can find a lot of the same parts offered under the Ford Racing brand (or whatever they call it now) in the OEM repair parts catalogs for a lot less than what the kits are being advertised for. Doing a little bit of homework can save a lot of money. Not always, but quite frequently. https://levittownfordsupercenter.com...n-parts/#parts