I looked at photos online and purchased a Van's "THRTLE/MIX BRCKT IO 320/360/540 Vertical Induction" which is VA-182-PC... looks like it'll work. Here's what it looks like on my engine: https://photos.app.goo.gl/H8KxhYQY4BPGqigD6
I could cut off the mixture cable part of it, aircraft left.
The other option Van's has is "THRTLE/MIX BRCKT/360" which is VA-149-360-PC and looks like it would work also. Here's a photo of it I found on the internet: https://photos.app.goo.gl/kNKbMwy0Jhpq9rB93