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Discussion Starter #1
Least week I changed out my water pump with no big issues, off and on is less than an hour. No where the problem arose, the infamous T50 torx head screw off of the idler pulley. I have the bit for it but for the life of me I could not get the old one out, even took it to a mechanic and he could not get it out. So I called my local dealership and the guy said yep we have two I'll hold one for you. Got out there and he had the pulley not the bolt. So he searched online and found a dealership nearby that had one and they shipped it to his dealership. went by later that afternoon and picked it up. Got home, the head fit the pulley but the diameter of the bolt itself was too small. I call him back and after a week and two more incorrect bolts suggested by mopar, my guy found the correct one. He looked up an 06 Chrysler 300 with the hemi and bingo, it is the right bolt. I don't know what all year hemi commanders use this same one but if you cant find it here is the part number.

Chrysler part # 6508778AA
 

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Good information on the part number, but what happened to the original bolt you took out? did you break it or drill it out? Why did you need a new bolt?
 

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Discussion Starter #3
I had to drill it out to get the pulley off, I could not get the torx screw out, even my mechanic I took it to couldn't get it out.
 

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Use anti-seize or blue threadlock on the new bolts. The anti-seize will prevent corrosion and seizing together of the bolts, the thread lock will solidify and seal out any moisture or contaminants that would cause the seizing.

Pick one of the other, you can't use both, they aren't compatible. Big bolts, I use anti-seize, the thread lock just can't cover all the threads, plus I think a big bolt totally covered in thread lock may be too hard to remove. Small bolts I use thread lock.
 

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If you replace your 5.7 water pump, save some trouble and buy a new idler pulley for $16 and get a new bolt and washer from a hardware store <$2. M10-1.5x40mm. My torx bolt stripped and drilling it out to reuse a $16 pulley was not worth it. Plus, dealer wanted $15 and 1 week for a new bolt.
 
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