Pull a bellhousing bolt out and measure it. It will have to be longer depending on the mount for you engine stand. But you can use washers to fit it up snug. I have a set at work but don't know what they are off hand.
I do not have any bellhousing bolts. I bought the car with the engine out. Turned out the guy had alot of bolts in the oilpan on the crossmember so I lost most of them on the way to my house.
I do believe they are 3/8" bolts with coarse thread, which would be 18 counts per inch, If your gonna buy some, get alan head bolts, the tensile strength is much greater than a grade 8 bolt, just be sure they will be long enough, I think I use 2" long bolts, but you can use a ruler or tape measure to get your right length.