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Hey Stevo, I had the same problem with mine. Problem is, this bolt realy isn't supposed to be a shear bolt. It is a coupling bolt, and can be ordered through your local AC dealer. They are a bit pricey, at about $11 a piece if I remember right. They are a special bolt, in that they are shouldered all the way through the shaft and collar, and then the threaded portion is downsized. If I remember right, it is a 7/16ths shoulder portion, with a 3/8ths threaded portion. I seem to remember one of the online suppliers (can't remember which one) having the same part for about a buck cheaper, but then your have to figure shipping. I had my PTO box apart to replace the seal, and the hole in my stub shaft was worn oblong like yours. I had a neighbor weld it closed, then drill a new 3/8 " hole through it, as well as welding a new collar on the PTO shaft with same size hole. I've been using a shouldered Grade 8 Hex bolt instead of the high dollar factory part, without any problems. The key, i think, is to get the slop out of the through hole, and to use a hardened bolt. It would also be very helpful if whatever PTO driven implements you're using had either shear bolt protection or a slip clutch, to protect the PTO driveline. Good luck with yours...
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