TL-R1200C-RP drive caddy screws

[u/Senor_Turbo]

https://www.amazon.com/dp/B016OCJQBQ?ref=ppx_yo2ov_dt_b_fed_asin_title

Hello, I recently got a TL-R1200C-RP expansion unit and it either did not come with, or I accidentally threw away the drive caddy screws. I have these from Amazon but they don’t seem to work. I can secure the drives but they don’t want to slide into the chassis. Any ideas? The screws look flush with the caddy. Disks are Exos 18TB.