Power Brake Booster Kit

[zipper]

I installed a CPP front disc brake conversion kit on my 1968 C10 last year. I'm currently looking to install a power brake booster. However, I'm having a hard time figuring out what power brake booster kit I should get. I have used ECE parts on vehicles before and like the quality and customer service. I live in Alaska though, and the quote I got for shipping is $120. So all in the ECE kit would cost me around $510 shipped. I was searching on Ebay and came across a setup for less money and way cheaper shipping.

So I'm wondering if anyone on here can help explain the difference between these two brake booster kits and what additionally I would need to install the ebay setup onto my truck? Thanks.

ECE Setup: https://www.earlyclassic.com/node/1464
Ebay Setup: https://www.ebay.com/itm/1967-1972-C...m/330948170372

Also, I added a photo of my truck. Thanks in advance everyone for the help! Love this truck community.