W123 Non-Typical Speaker Questions

[Squabble]

hey all, i've got a euro 280E w123 that was optioned without rear speakers. the speaker deck just has the first aid kit, the rest is intact with full carpet across the whole thing.

does this mean i can just cut any size rear speaker holes i want? is there any metal body holes or brackets under there that would keep me from just doing what i need for any speaker i set i buy?

regardless, anyone have any tips to do this? i have a somewhat rare interior color so i figured rather than just trying to find it at a junkyard i'd cut my own holes. good idea/bad idea? are there other parts i'm not aware of that set in there that i'll need to pull from the junkyard?

thanks!