92-94 flanges have 5 bolts. Here's a shot of the J30 I did:
240's come with 6 bolt flanges. If the J30 diff is 95+ it should have 6 bolt flanges as well. They look like this:
It shouldn't matter. If you get the whole subframe with axles, you'll have all the parts you need. $100 is a steal!
Chris