When I was searching for my D44 I considered these axles. I dropped the idea because of too much uncertainty about it. Apparently the widths differ depending on year. 93-95 is 56", 96-97 is 59 3/4, 98+ wasn't clear... somewhere between 62" to 64".
It also is 6x5.5 like you said. It also has metric brake lines. But if all the conversions have been made and you can verify the width then it would prolly be worth it. *shrug*