CMC Marine Upper Transom Bolt Support Plate (for High Performance Outboards)

CMC Marine Upper Transom Bolt Support Plate (for High Performance Outboards)

Marsoni

M251S

$63.95

Get it in 3 business days with 1 day shipping. Friday, May 29

CMC Marine Upper Transom Bolt Support Plate (for High Performance Outboards)This is for the large top plate in the picture. Made of strong 3 8in. 6061 T6 alloy aluminum (not cast aluminum), these transom plates eliminates bolts biting into transoms and can more evenly distribute loads on high performance engines. Top Plate hole centres: 12 7 8"

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We offer a 30-day return/exchange service after receiving.
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I used this to change the oil on my BMW M8 with the S63 engine. It was a perfect fit. It extended far enough onto the filter housing to be quite secure with no risk of slipping off and stripping the housing. It was snug on the housing and did not bind up due to having a loose fit. The tool feels well-built and I suspect it will outlive me given my occasional personal use. It would still probably hold up well even for daily shop use as long as it was not abused (repeatedly dropped, slammed around, etc).

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Reviewed in the United States on September 8, 2025