It’s the extremerate set of buttons for the pro controller. I was surprised to see the little buttons had replacements, because the pictures on amazon don’t show that! https://www.amazon.com/gp/aw/d/B07VPDCQJ7?psc=1&ref=ppx_pop_mob_b_asin_title
All from ExtremeRate! https://www.amazon.com/dp/B07VPDCQJ7/ref=cm_sw_r_cp_apa_i_UYENFbD8SDFQ9?_encoding=UTF8&psc=1 They have their own site too