The short bolts for the bottom are in stock with Summit again... Just ordered a set.
The short ones are for the bottom on all 2013/14/15 QuickDrive equipped sleds... The 14/15 have a longer top bolt as outlined in the first post of this thread.
http://www.summitracing.com/parts/arp-663-1001/overview/
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As far as I understand the bottom ones were never out of stock. I ordered a package of each about a month ago and got the 663-1001 about 24 hours later seeing I am from Michigan. The 663-1005 on the other hand were supposed to be shipped the 14th but an e-mail from Summit a few days prior stated they were still on back order from ARP due to a manufacturing issue. The new date they gave me was the 19th.
I wish I could have just gotten a set from someone instead of dealing with the delay.
http://www.summitracing.com/parts/arp-663-1005/overview/
UPDATE: Bolts never showed up so I called today....They were gonna email me again after the first of the year to tell me the bolts now will not be shipped until the 3rd week of January.....Nice people but very very poor communication.
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