Totally my opinion only.
laptop opticals are pretty generic, you just have to know which one the standard or the slim, don't quote me I think 9mm or 12mm thick. The remaining item is, to make thing look stock (as if you got it directly from laptop vendor) the front bezel must match else you gonna end up with an ugly hole.
So take it apart, put a caliper on it see how thick the thing is, pull off the bezel and notice how it's mounted and the location of the eject button, buy replacement that looks like it will fit, location of the eject button.
Don't want to go through all this hassle? by directly from laptop vendor or go external.
Pssshhh... once you take it out, you may find a label that says this optical is made by... LG model blah-blah, and BAM! there u go, just buy another like it, if all you are interested is a direct replacement.