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My guess is adapting to supply chain issues. Sometimes steel is cheaper, sometimes nylon is cheaper. Some changes for improved manufacturing efficiency - there was cut away in another forum thread I saw where bypass valve or spring was change steel to plastic or vice versa and another added hot glue to help secure bits in place during assembly.
Sucky part is keeping track of subtle changes in ACdelco part numbers - better off referencing the GM parts #.
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 ing for grip.
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