How about studs? 
You could also try ARP, they make some great stuff for race engines 
http://arp-bolts.com/
This is a 5/16X 2 bolt
http://arp-bolts.com/kits/ARPkit-det...?RecordID=2689
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2264 with 54 GT deck
1641 AKA Black Jack with a 402-E Haban Sickle bar mower
JD317 dump truck
BX2670 with FEL
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