thinking bout modding my SE stick and i wanna know whats the difference and which is better. thanx 
Read this guide:
Lizard Lick Amusements - Arcade Machines and Arcade Machine Parts
As seen in the guide, both are the same joystick.
For the SE stick you want 8YT, but if you get the 8T you can just rotate the PCB yourself and turn it into 8YT.
As for SK, which means that it includes a shaft cover, it’s mostly just preference and for aesthetics, so get it if you like the look of it.
thx