[41Joe]

I don't know about those kits, but Speedway Motors makes one that uses off the shelf parts. What I don't like about a lot of disc brake conversion kits is you have to buy that companies parts. At least with the Speedway kit, it uses 70's GM Calipers and 70's-90's Ford F100 rotors. (Part # 916-31986)
On my 41 Tudor I am going with the Speedway kit.