Vinyl insert trim, probably 1", doesn't come any bigger based on my research. Measure the gutter width to be sure, remembering you have to pinch the insert trim to get it to seat properly. Possibly 3/4" insert at the smallest. Comes in 100' lengths.
Based on the picture, maybe it's an optical illusion, but it gives the appearance the gutter base is bent, not the vinyl trim, but I guess you would know if there was some impact up there, right? Is this unit recently new to you?
If you're sure it's the trim that needs replaced:
I would test all the screws underneath. Lightly try to tighten them. If loose, back them out, put a dab of Geocel Proflex rv caulk on the thread and tighten but careful not to overnighten. Take care not to buildup a mound of sealant on the screwheads or it will make inserting new trim harder -.when installed it's a crown but clearances are not generous. Whatever Proflex is on the screw threads should give you a seal. I don't recommend rtv or silicone unless you're extremely careful with not overdoing it because those sealants, although effective in this application, are harder to trim once dried if over applied.
While at it, note where the length of gutter is butt jointed. Sometimes this joint, which was sealed at the factory, starts leaking, and allows water where it's not supposed to go.
I had leaks on both sides of my cabover because of a couple loose screws under the insert trim. Luckily a little delamination and not structural. That was 6 years ago.
So, it's possible your issue is associated with the screws under the insert trim if they're loose or a leaky gutter butt joint.
Any seam or wall screw above or adjacent to your porch light, or the porch light seams, could be a cause too. I like to address all possible causes but based on your picture you're on the right track.
If that doesn't fix the problem, let me know.
A few more pictures, with a big picture of the area, afterwards might help.
Get this brand. I replaced all gutter and 4 corners.
RV Designer E461, Heavy Duty Vinyl Insert Trim, 1 inch Wide, 100 foot Roll, White
https://a.co/d/e0R1Ra9
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