Not endorsing a fix other than replacement and consider that the squeaking may be communicating it is about to die rather than it only has a lingering, chronic squeaky cold.

If you can find where the original lube exited that could allow you to insert some lubricant. While not on suspension parts, I have used a hypodermic needle for similar situations. Depending on the needle, the hole it makes generally seals itself and it is possible to inject a light grease.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas