I'm not familiar with Scrub bindings so I can't comment on what you can use to replace them other than the obvious (what you have already).
Also not sure where the bindings ripped but I can tell you that bindings will rip where the bolts pass through them to meet the anchor plate. Make
sure you have a washer on the head side of the bolt to spread the load but what I've found is that while the washer helps prevent a pull out of the
bolt the washer also cuts the binding and can / will tear it. I just picked up another set of bindings for my board and while I was there another
rider did too. Our consensus was that bindings will wear out if you ride hard.
I've been boarding for 14 months now and I've torn my bindings (not bad enough to discard yet), blown a tire, swapped out cubes and performed bearing
maintenance (and I ride on grass). Not saying I'm common but I am convinced that there is only so much stability you can build in to these products
before you sacrafice the flexibilty and lack of weight a rider desires.
Depower Quiver: 14m Gin Eskimo, 10m Gin Eskimo III, 6m Gin Yeti, 4.5m Gin Yeti (custom bridle and mixer)
Fixed Bridle Quiver: MAC Bego 400, JOJO ET Instinct 2.5 & 5.5, Lil Devil 1.5, Sting 1.2
Rides: Ground Industries