For sides look here:

https://www.pinballlife.com/playfield-glass-side-rail-plastic-channel.html

I used that on Elvira. It should work on PinBot.

For the back, maybe this:

https://www.pinballlife.com/playfield-glass-rear-plastic-channel.html

Might want to email and find out.

Make sure you clean any and everything that goes from the old playfield to the new. Consider tossing old light sockets because in a PinBot they are about 35 years old. Look at some of dmacy 's most excellent swap threads. Use Pinside as a resource. Make a thread, document your process, ask questions, and LISTEN to experience.

Read through these threads:

https://pinside.com/pinball/forum/topic/vids-guide-to-ultimate-playfield-restoration
https://pinside.com/pinball/forum/topic/vids-guide-re-populating-playfields
https://pinside.com/pinball/forum/topic/cleaning-playfield-harnesses-vids-guide
https://pinside.com/pinball/forum/topic/vids-guide-to-upgradingrebuilding-flippers
https://pinside.com/pinball/forum/topic/cabinet-restoration-vids-guide
https://pinside.com/pinball/forum/topic/pinbot-fans-and-owners-club
https://pinside.com/pinball/forum/topic/vids-guide-to-rebuilding-pop-bumpers/

Be prepared for this to take months and take your time.