Is it the one that bolts/screws the cable to the gunnel? Kind of a u shaped bracket with 2 holes?
If it is, outboards and I/O's use similar brackets and can be found at any boat shop.
I used a bracket from summit on the foot throttle- cable hold down.
If this is not it, post some pics up. I've made billet clamps out of 3/4" alum plate and a drill press.
Dan'l