I've been building my computer since July and have just now decided I want to do water cooling my problem is that i have a pretty short attention span and i dont know what fittings work with what and the only thing i know is that ive been looking at monsoon fittings and havent understood the numbers ive also got all the things i wanted to get not knowing if they would work together or not so heres my list i copy pasted
EK-MultiOption RES X3 150 - Liquid Cooling Reservoir - White Acetal (6 Total Ports)
EK ASUS GeForce 780 GTX DCII VGA Liquid Cooling Block - Acetal + Nickel (EK-FC780 GTX DCII - Acetal+Nickel)
EK ASUS GeForce 780 GTX DCII VGA Liquid Cooling RAM Backplate - Black CSQ (EK-FC780 GTX DCII Backplate - Black)
Long story short, unless your cooling blocks specifically say otherwise, you're using G1/4 thread (it's a British measurement, who knows why that's what we chose to work with), so find fittings that have a G1/4 thread and are whatever ID you want your tubing to be. So if you're using 3/4 OD x 5/8 ID then you want G1/4 5/8" fittings.
Not meaning to sound like a jerk, but I personally don't have time to go through all of your items and check to see if they work with each other. Chances are they do, G1/4 is the go to standard for almost all water cooling components. I've given you what you need to know. If you have any other questions, I'm glad to help.