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Scott can probably cast parts for you from urethane. Meanwhile, if you have the M70A, you can use
IMPELLER : 45A2 ~ 70A2
Impeller only.
Fits:
45A2, 50C, 55B, 60A, 70A & 70A2 2-stroke models
Part # 353650210M
$42.50
Available from any dealer, including me.