I found your diagram a while back, definitely helped more recently when all my saved bookmarks to the adaptronic forum were dead.

This is what I'm using to handle the fuses and relays. It's made by GEP and has a weather tight sealed cap.

 

I eliminated the fusible links on mine by using the TII underhood main fuse box & relays when I did my TII swap...

1991 TII wiring from FSM:

 

Before start replacing it is good to know symptoms of bad fusible link. Read This guide for more information