I use PureONE oil filters and the part number is PL24457. Have one on my 97 stagea now, no problems. There is also another oil filter and its V04 part number, can't remember the brand though..
And I also use MOTUL turbolite.. when we checked the oil before the drags it was clean.. so didn't change it, and its still clean.. Its been 5000k'sor just under since the oil change