With help that you can get from TBN... heck you can build a whole tractor!!!!
The W.R. Long kit is expensive for one connection but many people love to be able to press a button with the thumb and never let the hand move off the one joy stick. If I only needed one function... I would think hard about that one. It's pretty easy to install compared to what I did.
I wanted 3 spools for 2 more hydraulics out back for hydraulic top and side links so the route I went was (somewhat) cheaper but it is not a KIT. You have to plan and it a longer "thought out" process... trying to figure out what you need and most likely a couple mail orders later...
Is this your tractor...
TractorData.com Massey Ferguson 1533 tractor information
Main thing there, is you're an "Open Center" and your flow is "9.1 gpm" mine was 6.2-ish and could use the 8 gpm max where you would have to step up to the next size.
Plan to read lots of threads about hydraulics... and when you get to the point where you think

you know what you are doing, post questions in the hydraulic section. The power of the hydraulic pump goes from one thing to the next, each able to use the power as long as what's up stream is not using the power. I put my spool after the FEL but before the 3ph.
The location of the spool/valves is one of the first things you need to figure out. I mainly located my spools mid way mainly because I didn't want to clutter up or block the view of the three point hitch. We're called "compact" tractors for a reason.