I'm having starting problems need help please!!!!

I have a 1988 ford bronco 2 XLT, I purchased it for
fairly cheap cause of damage to the windshield,
however a couple days went buy and it wouldn't
start. I've owned one of these in the past and was
somewhat familiar with certain issues. When I
turned the key the starter would hit the flywheel it
would just soon. So I got a warranty on the starter
cause the previous owner purchased one a couple
months back it was remanufactured. While at
AutoZone the guy told me that when turning the
key of the doesn't engage the starter every time it
could be the solenoid switch (under the passenger
fender) so I get home hook up the remanufactured
starter and it cranked for a split second with an
awful noise then went so spinning again so looked
the starter again and the casting where the bolt
threads through was broken off so took it back got
for a different one and tried to start it and it
wouldn't even spin, went back to AutoZone for a
solenoid switch and now turn the key does nothing
in fact my oil light comes on with the rest of the
dashboard lights, when I try starting it from the
solenoid the start spins and doesn't hit the
flywheel... I was told by a mechanic friend that I
could try putting in shims. Does anyone have any
advice or know where I can get shims that would
fit