Keep calling Flux, here's my experience with them. The first time I called them for parts I was told they were waiting for a shipment and would ship the part, no charge, within a couple of weeks. I waited three weeks then called again, this time I was told the part I needed was not available, and would never be available, they offered a substitution in a different color for $20.
The part I needed was the cover that goes over the high back adjustments, It fell off the first day I used the bindings. It wasn't worth $20 to me and i thought it should have been covered under warranty anyway but i was told that parts falling off was not breakage and therefor not covered.
I waited another couple of days then called a third time, I talked to a different guy each time and on the third time the correct part was suddenly available and shipped no charge.
I replaced the part, sold the bindings and happily went back to riding Burton bindings.