Clear Side Marker + Sellotape?
 

Purchased my BRZ used, and got a great deal, but discovered the prior owner has Sellotape'd the drivers side clear marker. Assuming he/she broke the mounting during installation.

Any ideas on ways i could fix this? Gorilla glue?

http://img401.imageshack.us/img401/2816/xho4.jpg

Try a hair dryer and heat up the tape and get some floss and floss it out. Maybe you can source out a clip with someone selling their oem ones? Hope that helps

I know my JDM clear side markers were hell to put in and they kept on falling out until I bent the metal clip a certain way. I'm sure the original owner couldn't get them to stay in so he/she just taped them to the wheelwell. Assuming this is the case, try peeling off the tape, letting it pop out, bending the metal clip bit by bit - then apply force while pushing it into the fender.