Oli... I have two full boxes of these in 7/8" (-7)... and many other sizes. Let me know what all you need and give me an email address to send a paypal invoice to. I'm happy with a $1.25 a clamp + postage.
The ones I have take 1/4" bolts.. can't tell from your picture if those are 1/4 or 5/16.. so check first and make sure what I have is as heavy duty.
No doubt Mike.. no doubt. Figured I'd help a local Canadian out.. even though he's on the other side of that "eastern border" and speaks funny..... LOL