There are other flaps available but the ones I clicked on only gave model numbers of vent they were designed for. No idea what the model of this vent assembly is but the louver this replaces measures approx: 1.25" W x 4.75" L, 0.25" D. It's not modeled exactly like the original but fits and works. I used PLA and it seems to be holding up fine but it's also really friggin cold right now. Probably need a higher temp material in warm climates or if in direct sun.
Update - after a few runs of the dryer I've noticed that this louver actually performs better than the original ones. They get stuck open whereas this model swings freely.
The author marked this model as their own original creation.