My buddy just rebuilt his 170 top end and had the same trouble finding a new riser, He found a new one at a Mercruiser dealers site. I think he paid close to 500.00 bucks for it but it is an original replacement part. I think its a 98561 part no. Ill call him and find out where he got it and let you know.
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77 V20 cuddy with 170 I/O Mercruiser
72 16ft. Carolina w/a 25hp Evinrude
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