Looking for SE Push Rods Jam nut.
Road Captain
Joined: Jun 2008
Posts: 714
Likes: 53
The SE Quick Install Tapered (PN 18404-08) referenced in the OP have 5/16" x 24tpi jam nuts. When introduced a few years back, there were issues with poor quality jamb nuts that would hairline crack when tightened and loosen after a few miles. The MoCo seems to have solved the problem and I still run them in one of my bikes which make 110HP/124TQ; no issues since installation about 25K miles ago.
and it was a new production set
so problem still hasnt been resolved
I installed Quickies instead because thats what I had
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From: san antonio
Road Captain
Joined: Jun 2008
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I could be wrong for sure
I do Like the Quickies better once I tried them but thats my personal opinion
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90499A810... where have I seen that before 
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Ordering & info http://www.rockout.biz On ebay! ... CLICK HERE
Also on amazon.com...
Imitated, never equaled... ROCKOUTS!
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From: SF Bay area
More confirmation is always a good thing for the OP 
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When I measured mine the first time it was through the zip loc bag I had them in.... I didn't realize the threaded part had FOUR flats on it & I was measuring across the flats.
Soooo.... I own this. PM me your name & shipping address & I'll send you the nuts off of mine. Or, I'll PayPal you the $12, your choice.
My sincere apologies for the trouble.
John
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