vtec -vs- non vtec distributor housing question.

whats the differance between vtec and non vtec distributor housings?? also, diff between obd-0 and obd-1. can i use an LS housing on my gsr??

the reason i’m asking is because i think the bearing has some play in my current one. i don’t have the money right now to buy a rebuilt one just to test my theory, so i wanna get a used one with a good bearing, but i don’t know if i have to search and hopefully come across just a housing for a b17. help will be greatly appreciated!!