Hi China,
Now I'm at home I can tell you it is the 4490 that I've got.
The light in the lid is a strip down the middle, most of the length of the lid, but only 8cm wide. Your 3 x 5 negs should just squeeze into that. To keep them flat on the platen/stop them moving around, if needed, I use a strip of paper across each end of the neg, and attach that to the platen with a tiny bit of sticky tape. Then I clean the platen afterwards with a bit of metho or window cleaner.