I have this pack and can attest that it is nothing short of fantastic. Dana Design, if they're still in business, will sell different size belts. The top of the pack comes off and when attached to the belt, becomes a fanny pack. The top of the aluminum frame detaches with cotter pins and can be raised up a good 5-6".
Dana packs are very versatile and comfortable. I've carried 65lb loads in my internal frame Dana and imagine the external would carry this much even easier, though I haven't tested it with that much weight.
My $0.02: Replace the buckle and re-list it. This is a great pack and with the buckle replaced, will be a hassle-free great deal. If I didn't have one already, I'd buy it.