I have a friend who had "Trail & Lake Sports" in northern MN.
He has a Boat Load of controls hanging up in his storage buildings.
If you know what you need he will very likely have a good used one.
Assuming you are looking for original.
BTW, he has more boat parts than you can imagine !
I walked thru his buildings last weekend and lost count of all the stuff.
If you need it, he very likely has several. Not even joking.
Hundreds of Outboards (+ a big shed full of steel tanks), Countless Outdrives, Manifolds, Carburetors, Lower Units for miles.
He has racks of NOS stuff on shelves for all makes and models, etc. etc.
I also stopped at my favorite Boat Boneyard outside LaPorte and he has LOTS of old boats, including some vintage Glastrons.
Neil