Oil Filter.

[bultaco]

99 XT600E European.
Part # 4X7-13440-01

95 XT600EG. (U.S. Model)
Part # 4X7-13440-90-00
Power Sports Pro $ 7.00

95 XT 600EG. (U.S. Model)
Part # 289105-001
Bike Bandit $ 7.95

84 to 95 Use *CH6004 or CH6005.
* CH6004 uses the old thinner style "O" rings.

[bultaco]

Slight difference in the spring loaded valves may not be an issue, but the 3mm longer Fram won't allow the filter cover to seat properly, I've decided to return the Fram instead of risking damage to the cover, the CH6005 won't work on this bike.

[bultaco]

Returned the Fram for a refund and picked up an OEM Yamaha Filter.
$ 18.26 without "O" rings.

It's only slightly longer than the Champion but installs with no problem.