72 C20 factory air conditioning restoration

[MARKDTN]

That looks like a later (cycling style) square body accumulator and evaporator. The A6 compressors used to be great, but now the Sanden style like your retrofit kit are a better way to go. I think you are on the right track, but your system is not stock 67-72 so you probably can't just order hoses in a kit. You will likely have to have custom hoses made, but some of the better auto parts stores can make them or you can order them online.