suzukiboy

Don't know how to ask this question without sounds like a noob... but here goes.

I rang a guy here in Australia about getting a Octura prop for my hammer.
Asked about get a Octura X-432 or X-435.
He said a Octura X-438 would be a lot better, so I said ok.

I gave him or the measurements.
drive shaft hole dia
prop dia
pitch
boss lenght
boss dia
deep drive dog slot
wide drive dog slot

The Octura X-438 measurements are different.
I thought the new Octura prop would be bolt on, same measurements as standard..............??
Am I wrong, should it be bolt on or am I meant to mod drive shaft etc,

Thanks
Dave