More 3rd party cook grates:
Pit Barrel Cooker Co. is now offering plated (not SS) hinged cook grates.
One is a "18.5" (17.5" actual) and the other is a "14.5" (13.5" actual), so they should be a match for Weber 18.5" and 14.5" grill or WSM applications. $18 and $15 respectively.
Note: What makes them different is that
the hinge is at the halfway point on the grate. Might be of interest if you're using Adrenaline's Slow ‘N Sear® Charcoal Basket in your 18.5 kettle, or if you want to try hanging meat and grilling other food at the same time in a 18.5 WSM.
https://www.pitbarrelcooker.com/accessories-and-gear/