Hi not sure what you're calling a kit. Are you replacing the drums too if they are scored bad?. I did a set on a trailer and the drums where bad but replacement wasn't gonna happen on that job.
The surfaces the magnets ran on where scored to the middle of next week and the shoe surface was no better either. Those brakes never have worked good since and I bet the magnets and shoes are bad again now due to the scoring and ware. The replacement parts where Dexta but don't remember if they where U.S or China made.
Truth be told in that state cheapest would be best just waisting good money on those drums