I know your pain.

Two will hold (ask me how I know) and not leak with a little extra RTV; one...doubt it. If you can find a junk blower motor, the clips that hold the two halves of the plastic together MIGHT work.

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86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm