I got this one when it was in stock for $29. PSVita 2000, it just add L2/R2 not L3/R3. On RDR2 I was able to change the controller configuration so that I used the front touch screen for weapon selection and squatting.
This was the one that I got https://www.amazon.com/Psvita2000-r2button-Load-Grip-Cover-Black/dp/B00TP8KBJI/ref=sr_1_fkmr0_1?ie=UTF8&qid=1502465081&sr=8-1-fkmr0&keywords=l2%2Fr2+triggers+vita It was good while it lasted, but not worth the money when the Hori triggers are better priced and better quality