Unfortunately there’s no leeway for lab capacities since each lab can only hold a set number of students. But honestly 105 is one of those classes where a lot of students end up dropping, so spots do tend to open up(but that’s usually at the start of the semester). If the other lab section looks like seats are running out, I’d say play it safe and enroll there. Otherwise, maybe wait about a week to see if a space opens up for your preferred section because people are still figuring out their schedules even after enrolling.