If you can't find them and HAVE to have them then there are companies that will make bolts to order.
http://www.zerofast.com/service.htm
For instance, nobody made the 12mm x 80 x 1.5 that I needed. These guys had them to me in two days.
But be prepared for sticker shock.. limited runs of anything is expensive. Still, it's nice to have options.
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"A ship in port is safe, but that's not what ships are built for."
See Bad Penny run the cones:
https://www.youtube.com/watch?v=8GUPPIX-92U
1971 Chevelle Wagon - Roadster Shop Chassis ProCharged Shafiroff LS and lots of yada yada
1968 Camaro - Project Track Rat - 440 RHS LS