All WIX filters:
51335 2.483" by 3.660", 3/4-16 thread, by-pass valve 8-11 psi, drain-back valve, 280 psi burst pressure, 7-9 GPM Flow Rate, 21 micron
51085 3.836" by 3.660", 3/4-16 thread, by-pass valve 8-11 psi, drain-back valve, 340 psi burst pressure, 7-9 GPM Flow Rate, 21 micron
51085XP 3.836" by 3.660", 3/4-16 thread, by-pass valve 8-11 psi, drain-back valve, 340 psi burst pressure, 7-9 GPM Flow Rate, 21 micron
51068 4.338" by 3.660", 3/4-16 thread, by-pass valve 8-11 psi, drain-back valve, 275 psi burst pressure, 7-9 GPM Flow Rate, 21 micron
I'm assuming you are talking about the filter being too long as opposed to too wide, yeah?
FYI - I ran into this problem with my 1-7/8" tube TTIs...running 51085 and it barely fits...so much so in fact that I've already picked up remote setup and just need to install the darn thing!