best brake conversion
First, you can get this same kit from DoctorDiff with better parts and better customer support.
Second, it will not work with MANY of the SBP wheels out there, especially original drum wheels. Like the usual 73+ brake conversion used to go BBP, the '73+ disks widen the track width and have a significantly larger hub register. These kits usually turn down the hub register compared to a normal 73+ rotor, but it remains larger than the hub registers for original drum wheels and others.
So, if the intent is to keep your factory SBP wheels the 73+ based kits are not usually a good option. From a braking standpoint they're a great conversion, but with regard to keeping the 5x4" bolt pattern there's more to consider. There are also aftermarket brake kits that have both patterns, but again pay close attention to track width and hub diameter, because like the 73+ based conversion kits most of those aftermarket kits will also not allow for use of all the factory SBP wheels.