The HiFlo HF 183 filter fits the Blur and all the Buddys (and all the modern Vespas). They are available at a wide range of on-line sites (Google is your friend ). I get mine from ScooterWest. As far as gear oil - lots of choices. Just match the spec in the owners manual.
Thanks for the info. On the gear oil I was wondering because read on here in some thread where some one was using lucas 95/145 wt oil. Specs call for 145 wt, just wondering what others use.