[PS2 Slim] Where did the 2 plastic pieces on the right come from?

[u/GensouEU]

I currently have the problem where my CDs only read when the console is upside down (DVDs still work fine) so I'm currently trying to reduce the resistance a little bit and cleaned the lens, rails, and gear (feel free to chime in with other suggestions). I'm now putting it back together (I only loosened the laser nothing else) and noticed these 2 white plastic pieces that look like they belong on some kind of switch but I didn't notice them while disassembling and I don't see them on the iFixit site either. Anyone know where they belong?

[u/punx9909]

Those hold the right laser rail in place