I have installed Profill pre-filters into my 990 Adv Safari tanks. These are model ACE001. The fit is good, although I little filing or trimming around the outside edge might be beneficial...occasionally the caps will pull the filters out of the tanks, so they bind very slightly, but it's not enough to bother me so far. It takes a little longer to get the last gallon in each tank, but this is a small price to pay for the potential benefits of (maybe) never having to change pump filters... Note that since I bought mine the website states that all filters have been improved for 2014, and it is worthwhile checking with them via phone or email to see if this model is still the one recommended for 9x0 Safari tanks...they are updating and adding all the time. http://profill-australia.com/e-store/STORE.html As far as I know, they still have no solution that works with the standard KTM fuel caps. This only works for Safaris. For a prefilter solution for the standard tanks, contact CJ...I saw his machined adapters at the Steamboat rally - very elegant.