they are both standerd ac delco plugs. the old on i just pulled out of the car reads R45TS and the new one I just got reads R45TSX. why is there an x at the end. it is for a 1989 gta 350tpi. the kid at the parts store did not look to sure about what he was doing.

 

i think thats the platuim plug

 

it did not look platuim to me. It look the same as the standerd one.

 

r45ts for point type distributor, ts x for HEI.