Rear fog lights?
Rear fog lights?
If as above, then it sounds like they're like the rear lights - so no they can't be opened up by putting them in the oven.
However could you cut them apart and then use a sealant or glue to put them back together like people have done with the rear lights?
Might need to try and find a cheap fog off ebay or something to have a play with
That's what I was wondering if it could be done.