Well I wouldn't call it an oem crash bolt because it doesn't exist! Its just a bolt. I couldn't locate the part number to the stock bolts as it wasn't in the MR2 parts number list but I do happen to have all four bolts in my possesion so I took a pic of them to show you:
The one without any dots is the stock bolt and the one with three dots is the smallest crash bolt. If I had a set of venier calipers I could also give you the diameter to the oem bolt but I can simply guarantee you that it isn't the same diameter as the one dot bolt.
Oh, its also recommened that you also replace the nuts. Given the high torque spec, the nuts and bolts do deform as their are tightened which compromises their holding ability. The nuts also appear to have some kind of greenish blue coating on the threads, I'm guessing it similiar to Loctite. They seem to give some friction when I tried twisting the nut onto the bolt using my bare hands.