need source for replacement Ford 351 engine bolts

In trying to replace the water pump on a 1996 Clubwagon with a 351 (5.8L) engine, one of the longer water pump bolts siezed in the block and timing
chain cover. I need to find a replacement as well as the the threadsize (so I can order the appropriate Helicoil).
Can anyone identify the Ford part number (or a website that I could explore) that will provide this bolt?
The bolt is about 5-6" long, and appears to be a 5/16th inch thread. it has a hex head located approximately 80% along its length. From the hex head to the end of the bolt is threaded for attachment of a bracket for one on the hoses on the passenger side of the engine near the water pump.
Any help would be appreciated.
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Check the thread on one of the other bolts-either going to be a 5/16X18 or M8X1.25. If you can't find the correct fastener, all thread and a nut might get you by. If you have suitable equipment you could braze two bolts head to head.
.3.8L uses a lot of these type fasteners but they are metric...
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Rick wrote:

look for a fastener / bolt shop here in winnipeg we have 3 such places that specialize in bolts
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