Rick-
I'm going to move this thread to the parts and services needed forum, but here are a couple of photos of the two bolts I've got. Sorry it took a while to find them. I imagine the smaller of the two is what you're looking for. Length from underside of large flange to the end of the threads is 23mm- about 0.90".
I'm not sure the larger bolt is even from a 48 IDA. It's been in my spares box so long I've forgotten where it came from.
Regards,
John