Hertz, I found these on Amazon
ZRM&E 8pcs 10mm Hard Disk Drive Screws and Shock Absorption Rubber Washer Kit PC Hard Disk Drive Mounting Accessories for 2.5 inches HDD SSD https://www.amazon.com/dp/B07DFZJPTQ/ref=cm_sw_r_cp_api_i_SHeLFbGYKNM2C
Something like this as the space inside the Denon is very tight. If there was more room they make better more absorbing shock solutions.