there are 2 different sizes that come up in parts listings depending on what vendor you search. one site specs them as having same diameter, but a 5mm difference in the height of the filter.

I recall whatever I got for my Impulse from my local store was larger than that of my Trooper. oddly enough I thought about this the other day - I can crawl under & compare tomorrow.

here's 2 listed by RockAuto for both Troop & Impulse:
[Linked Image]
[Linked Image]
plain to see there is a difference in size.

2.6 Trooper
2.0 Impulse Turbo