5 lug swap front and rear

I've seen a few older Couriers with a 5 lug swap done on them...... What is needed to do this?????

I've still got the 6 lug on my 81 B2000. I don't mind them at all, but they are covered.

http://static.mazdabscene.com/userphotos/2016/101/22323/l.jpg