2 to 3 inch. Pretty much the same I use for walleye. Last time I waa out I was actually looking for walleye trolling a 3 inch gold crank that dives to 10 feet and caught two jumbos when I passed over a big hump. Ended up finding a great perch hole and pulled out a couple that broke a lb.
There are usually a few in a school that are very aggressive and will hit bigger lures. Or you can cast an area with a large spoon and just watch for follows if the water is clear enough.