Does the 50 Mt starter flange bolt directly up to the clutch housing or is there an adaptor needed and does it require a differant nose cone. I know it requires the 12 tooth right hand helical drive.  Just trying to nail down the facts on this cause there is a lot of differant suggestions of what is needed to do this lol. Thanks all 

Takes the aftermarket oversize adapter drive end housing, same as used on D8 and D9
 

Now I also here somethin about and oil seal and long nose and short nose . I ordered a 50mt starter but it had the left hand helical drive 11 tooth on it . So now I have located a right hand 12 tooth helical drive for it but they asked if it was long or short?

Long nose applies to the original starters. Conversion starters use the short nose (shorter vs long armature) and same RH helical drive used on D2,4,6,8,9 starters. LH helical drives are hard to come by and used on buzz bomb pony conversions D4,D6.
You need the current conversion drive end housing sold under the 371-12144 part number which are also somewhat hard to come by. Currently available on ebay at $160.
Side view should look like this when your done...
 

My starter does look like that except it has the left hand version of that drive. Is that a conversion for the generator in the picture what is required for that conversion if you don't mind me asking.

Was that one of the ebay starters you bought that had a LH helical drive?
The alternator conversion shown is a custom conversion based on a modified generator housing. I believe it was done by an individual up in Canada, sorry I don't have more info on the source.
Auto-Lec is about the only common source conversion I'm aware of. No body seems to know who actually manufactures these units.

Yes it's one of the ones off ebay I sent some pictures of it. The alternator I may try to do that with my generator and machine a longer drive for it and see if I can get something put together out of an alternator and generator .Would be something good to do. May help some other people out looking to do something like that.

Please see pics attached.

I don't know why they put a LH drive in there, D7,8,9 conversions all use RH helical drive.
The commercial alternator conversion drives have an intermediate bearing support, a lovejoy coupling and cooling fan (from a CS130) small diameter fan. Bit of a challenge to incorporate into a generator housing conversion but can be done.

True would be a challenge. But I've learned from thirty years of machining anything can be done just about if you want to bad enough. Is the alternator setup in the picture 12v or 24v. I had been thinking about trying to convert a 24v alternator off a cat 920 and adapt the gear drive to it. Hadn't really looked to close just have some of those alternators handy.