Hi Tony, That's all good information. The original bolt with the flat, is actually an integral part of the factory pulley, and can't be re-used. The flat is designed to keep the bolt from spinning when installing it on the bracket. The replacement pulley mentioned below includes a shoulder bolt with a hex head, so there is no need for the flat. Therefore, the flat spot on the bracket needs to be filed to allow the bolt to pass through. There is also a lock washer included with the replacement. That lock washer, I believe, is a vital part to include in your installation. That is, if you don't want to be stranded with a missing pulley and a fubar belt, some day (and maybe a big dent in your hood). I drove my H about 1,500 miles since I installed my Bouchillon part without any issues. It's a good thing. Regards, Mark -----Original Message----- From: Tony Rinaldi <awrdoc@xxxxxxxxx> To: Mark Souder <MRS954@xxxxxxx>; finsruskw@xxxxxxxxxxxxxxx; Chrysler 300 Club <Chrysler300@xxxxxxxxxxxxxxx> Sent: Thu, Sep 2, 2010 10:57 am Subject: Re: [Chrysler300] A/C idler pulley update Hi Dave & Mark, I looked back into my research notes re the specs on these idler pulleys hich were for 1959-1965 A/C RB engines which use 7/16² belts. The Mopar pulley accepts 7/16² belts and is 3 3/4² in diameter. The ftermarket replacement pulleys at parts stores accepted 3/8² belts. > I called Bouchillon. They say that their replacement IP is 3 7/8² which probably would be OK. They also give a belt width range from 3/8-1/2² If the Bouchillon pulley works with no issues, then it seems like a good alternative. At the time, I rejected it. Original bolt and pulley bracket have mating flats to prevent the bolt from rotating. It is unfortunate that Mopar no longer has the bolt and shield available. Hopefully those who use the Mopar replacement pulley have mounting bolts and shields in good shape. Tony Rinaldi From: Mark Souder <MRS954@xxxxxxx> ate: Wed, 01 Sep 2010 19:59:54 -0400 o: <finsruskw@xxxxxxxxxxxxxxx>, Chrysler 300 Club Chrysler300@xxxxxxxxxxxxxxx> ubject: Re: [Chrysler300] A/C idler pulley update ave, ancel that order and check www.bouchillonperformance.com and look for part umber BPE4025. It is exactly what you're looking for, and it costs less han $24.00. You might have to wallow out the flat spot on your existing racket, but it fits and works well. I did this on my 300H this Spring efore I drove to Myrtle Beach. Regards, ark Souders 00H ohrsville, PA -----Original Message----- rom: Dave Schwandt <finsruskw@xxxxxxxxxxxxxxx mailto:finsruskw%40iowatelecom.net> > o: list server <Chrysler300@xxxxxxxxxxxxxxx mailto:Chrysler300%40yahoogroups.com> > ent: Wed, Sep 1, 2010 4:28 pm ubject: [Chrysler300] A/C idler pulley update FYI hecked at the local Chrysler dealer today for available parts needed tp rform the A/C idler pulley update as sugested by Toni Rinaldi in the tech ction of the club web site. ot good news as only the pulley and nut are still available, the shield and lt being NS1 3830196 Pully $41.60 271507 Nut $4.25 ordered 1 pulley and will see what I can do with it. ave Schwandt Non-text portions of this message have been removed] ------------------------------------ o send a message to this group, send an email to: rysler300@xxxxxxxxxxxxxxx <mailto:hrysler300%40yahoogroups.com> o unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx mailto:Chrysler300-unsubscribe%40yahoogroups.com> or list server instructions, go to ttp://www.chrysler300club.com/yahoolist/inst.htm or archives go to http://www.forwardlook.net/300-archive/Yahoo! 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