Axel housing length help

[Waytec]

So am almost done building a trailer out of a old MJ box. I need to order a axel on Monday and I need to know the brake drum face to brake drum face length so once it is in the tiers will sit in the correct place.

Thank You for your help guys

[mvusse]

I believe (but don't quote me on this) 60.5"

 

But about 2 or 3" wider would look better.