There are plenty of axles that are narrow enough to work. That's not the issue. The issue is there are none that will work with 27 inch spring center width. Nearly every 4x4 built since the mid 50's uses a 32-36 inch width spring center. Since you can't have the spring sitting on top of the pumpkin. You need to scoot it over. Now honestly hundreds of custom narrowed axles. Both front and rear. Are made each week in this country. And most of the parts to make a custom 4x4 front axle are available new. But truth is the cutting and narrowing of the housing is very easy. It's about a 2 hour job. And a number of shops cut and respline axles. Most only charge 75-100 bucks per shaft. It's all pretty simple stuff. Plus if you have a sm420 trans. You can by an adapter to bolt a dana 300 t-case to it. Don't even need to add a crossmember.