You could likely adapt a late model fuse box if you're really good with wiring. The easy way out would be to buy a box from http://www.painlesswiring.com that comes with complete directions. By the way, your headlight switch has an internal breaker. So if you're having the flickering headlight syndrome...common in old Fords, just buy a new switch. Autozone or any of the chain parts stores should have one.

Jan