HELP!! 742 Sure Grip Spider gear needed!!

I took a quick look this morning for them, there not were I thought they'd be. I'll look in the garage and the parts storage shed tomorrow, when I have more time. They're here somewhere, even the wife remembers seeing them not to long ago.

There's a difference between open and sure grip ? I honestly have no idea what these spider gears are for, case no., open...I got them in a parts lot.

I'll find them tomorrow morning and take pics, measurement and tooth count...and we'll take it from there. I hope you're not in too much of a rush, shipping alone will take at least four days.

Giles