8 1/4 rear end

I have been looking for an 8 1/4 rear end for awhile with no luck. I know that people swap in jeep XJ 8.25 axle and Dodge dakota's but would really like to stick with something that drops right in. I wouldn't be apposed to getting an 8 3/4 but with the prices being $500 bucks just for the housing I would prefer to get a 8 1/4 fully built for that price. Let me know what you have I'm going to be running a mild built 360 magnum with 904.