ive got a starter question

[tripton]

i have a 72 cheyenne 4x4,the motor is a 70 i believe. my starter solenoid went out,not thinking i went and got a new starter instead of just a solenoid.the starter has three bolts, two on the face and one that comes in from behind through the bell housing.simple enough...well the starter i got from napa seemed to be identical till i went to put it in.one of the bolt holes was about 1/4 inch off. i drilled it out , but once installed i gave the key a turn, grind! i took the spacer out,no luck. my question is do they make different starters for auto and manual trans? the guy at napa said no.not sure if i believe him though.my core is already gone,too.how and where do i find the starter i need?