Anodized 6061-T6 Aluminum AN fittings.

Are they compatible with methanol without corrosion the answer is yes and no. They see slight corrosion but it's on the microscopic level you will not see any visible corrosion. The rate of corrosion also goes passive at a certain point where it is no longer effected.

This is some good reading if you are into the techical aspects of why it is safe to use with methanol. This study was conducted by US Navy Suface warfare center with White Oak Labs. There are to many myths about how corrosive methanol is to aluminum parts. Being Anodized is the key factor in methanol resistance.

You will see this word a lot.
Passivation (chemistry) - Wikipedia, the free encyclopedia

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The corrosion rates of Table 2 calculated from the scans of the
anodized aluminum and steel samples are relatively modest with some
indication of greater corrosion of the steel. In the case of the
anodized Al surface (Figure 5), Table 2 shows an initial rise in
corrosion rate from 0.004 to 0.28 mpy followed by a decline to 0.18
mpy at 24 hours immersion. This indicates the tendency of this surface
toward passivation in the methanol. This is a desirable condition,
as the corrosion rate likely will settle to a comfortably low
value. The steel sample of Figure 6(bottom) shows evidence of some
zinc plating removal, but is otherwise unaffected.
The polished, unanodized aluminum sample of Figure 7 shows a
somewhat different behavior under potentiodynamic scanning. Table 2
indicates a corrosion rate of 1.3 mpy on the initial scan. After 24
hours immersion and a second scan, the computed corrosion rate had
increased to 3.2 mpy. Thus, in the absence of the protective oxide
layer, early passivation is not established. A longer term experiment
would be necessary to determine the extent of eventual passivation
in the methanol. Here the presence of absorbed water may play
a critical role. Generally, aluminum alloys will passivate in pure
water. However, if sufficient water is not present to help stabilize
and replenish the oxide layer, passivation may not be main-'
tained even in a relatively nonhostile environment such as methanol.
Although the corrosion rate of this unanodized sample is some
1OX that of the anodized surface, it is still at an acceptable
level, provided passivation eventually is established. Of perhaps
greater concern is the rather fine scale incipient pitting evident
after the 2 scans and 24 hour immersion [Figure 7(boctom)]. These
pits are apparently slow-growing. They probably result from a general
inadequacy of the initial oxide layer on the aluminum surface
coupled with the lack of sufficient oxygen, rather than any great
hostility of the electrolyte medium. Nevertheless, the relative
dearth of available oxygen for protective oxide layer healing could
allow the conditions for serious pitting to develop. This all
points to the value of the anodization In preventing initial deterioration
of the oxide layer.