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You'll have a tough time finding straight 90w. Amazon has a few used in marine and other special applications.
Moss motors sells a straight 90W GL4, Dynolite. Description:
Our classic cars require special fluid and oil formulations, in particular, gear oil. Newer GL5 oils have too high of a sulfur content which erodes yellow metals such as bronze or brass, which are commonly used in British applications. Our cars require a GL4 type oil and this Dynolite Gear Oil is perfect for our classics.
