Take your measure between the garage door and wall.
Gap between door frame and wall.
Use your scissors and cut this size.
3 place the vinyl strip on the wall side where the wall meets the garage.
So there is a gap between the wall and the trim and quite large in areas.
The trim has to be removed and the frame shimmed to close the gap.
The walls are old and not perfectly flush with the new door trim.
The bad news is that if the gap is the same top to bottom that door needs to be replaced.
2 measure the garage door height.
The trim work is all on.
I like to caulk between the molding and the walls before i paint the woodwork.
You fine tune the level by inserting.
The gap around a door frame is a structural necessity it allows you to fine tune the jamb level and acts as a buffer between the jamb and wall framing.
Place the shims between the hinge leaf and door at all hinge locations.
The following issue can be corrected by recessing the hinge leaf further into the door or frame causing the door to shift closer to the hinge side.
If that is true the door frame was built improperly.
This will shift the door towards the lock side.
The good news is if the top bottom gaps are more narrow the illustrated gaps can be fixed.
Lay down a strip of vinyl weather stripping and transfer the measured length on it.
There are is gap approx 0 1cm to 0 4cm between the interior door frame and wall as shown below.