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New prop for 70 hp 4 stroke , 21 ft ssx What size prop do I need

According to Benningtons "suggested" prop chart , 13.8X13. This is a suggested starting point .
You can also check with Ken at propgods.com
 
The modest HP with that rig means that expected load will dictate what prop will work best. Also focus on not just pitch x diameter, but on props rated for the relatively high load and low speeds (expect less than 25 MPH) of your pontoon. Pontoon rated props in the 11 to 13 pitch will likely be what you need. the gear ratio of some 70's might be able to use a 14p if the slip is high enough (a poorly matched prop can run slippage in excess of 30%).
 
I have 1 more question, during my attempt to lower Bimini to the wind blew whole rip off boat damaged the electric plugs for rear light.where can I find a replacement.
Thank you
Jim
 
If it's what I think you are referring to ,amazon , walmart or greatlakesskipper.com has some Bennington OEM parts
 
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