V belts for 87 230 weekender 5.7

[Gyroe1970]

For the love of pete I can't find out what the right part numbers are for the 2 v belts on my 5.7 omc engine. Im replacing the alternator and the water pump. Can anyone point me in the right direction? I ve been on several websites and there are so many part numbers to different ones I cant differentiate. My service manual doesn't say Thanks all!

Specs 1987 230 Weekender with 260hp 5.7 OMC engine and Cobra sterndrive.

 

[JVM225]

Is there a number visible on the old ones that you can use to cross reference?
If not, you can take them to your local auto parts store and have them measure them.