I’m sure there are a ton that will work just fine but this is what I purchased and they seem very solid:

Faswin 3 Inch Stainless Steel Spring Snap Hook Carab... https://www.amazon.com/dp/B01H1SK1SO/ref=cm_sw_r_sms_api_glt_i_QVRWXJFX391E1NNYVJYR?_encoding=UTF8&psc=1