distributor questi0n??

are there any distincitve marks or things u can see by comparing a LS dist. and a GSR dist. how are they different and how are they alike??
for example if i was to pick one up from someone how do i know im buying a GSR one and not an LS one…

oh yea one more thing hows about tha throttle body (LS and GSR)
do any of these have x-tra wires or anything??..thanx

the mounting points for a vtec(gsr) distributor are different then a ls distributor.