https://www.amazon.com/gp/product/B07QN89DY1/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

Perfect co-witness with 507. And not expensive. It's in their 3xl size range, so if you don't like the black out style, you could check their site for other options here - https://ameriglo.com/collections/products/glock-ameriglo-suppressor-optic-height-sets