The number I have crosses into the plastic housing assembly anyone have the number for just the inpellor?

Just the vaned rubber impellor: (no housing/kit)

Alpha: 89840

Bravo: 89740

Internet searches work pretty good for this kind of thing.

And my boats break a lot, so I do this all the time.

you are correct internet searches are good for this sort of thing and also for semi correct information that is the part number for an aftermarket impeller.
I have tried the globe after market one and lost water pressure and had premature failure so I wanted to go back to the standard Merc for which the correct part number is 47-89984T4

but thanks for the help anyway

I thought that people who looked for part numbers on a bulletin board always used aftermarket.... sorry.

I got to jump in here in regards to the Blue Globe Impellor. I also lost water pressure but that in turn reduced the maximum water pressure I was seeing at WOT. I ended up at 8 psig at idle and no more than 25 psig at 5000 rpm.
I was also using a crossover with bypass that had a 3/8" orifice in it. 142 degree T-Stat with (3) 3/16" holes.
155 degree operating temperature. Needed to control the oil temp though.
I now will be using a Mercury Racing Oil Filter Mount with T-Stat.
Sorry to go off on a tangent but losing water pressure was not a bad thing for my setup but a welcomed result of using the Blue Globe Impellor.
Russ

I will take the time to inspect after one season of use.
Thanks for the info Klaw.

I use www.mercurypartsexpress.com to find part numbers and also to buy parts. A Merc dealer told me if I got the part number and called him I could save the up to 40% markup that Merc does.