your not suppose to screw it in. your suppose to just slide it in.
try using a jack to lift some wieght off rod and gently taping it with hammer, making sure the otherside lines up. it should go in smoothly, you can throw some lube on it to help it slide too.
The wrong part must have been sent to me then. The bolt that came with them is the exact same size as the stock bolts, excpet very long. If I tapped it through, it would destroy the threads.