The Flexx boots are of thinner rubber so they will stretch and go over the hardware. Consequently they are good for "only" 10 years; the factory boots usually last 20. The real expense is the Flex gun -- I don't know if there's one in our tool rental program yet. If you have non-noisy joints and access to a Flexx gun, that is a good option.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970