This one on amazon has worked well for me although I haven't tried with that much weight:

https://www.amazon.com/gp/product/B01MRRMPH6/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&th=1

Not OP but I just bought this one on amazon. I just started adding hip thrusts to my gym routine and at 120 without a pad it hurts too much. I literally bought this in the gym after finishing my sets.