Hi, my new to me bike was missing the oil pump, but has the drive gear still installed in the side cover.I purchased one online, used and the listing said It seems very clean but the small line that goes to the cylinder has a fixed brass ninety degree fitting instead of the banjo  What bikes have the brass fitting?Thanks,Thanks!

Looking at my parts books , the pressed in fittings arrived with the 74 DT 250 A .
Of more concern is the fact that the wormshaft protruding from your case ,
was different for DT 250 A, B , & C , and different yet again for the D & E .
This shaft matches with a drive gear in the pump , so it's very likely your pump
won't engage properly .
I don't know how your pump was described , but you really need a DT2 /3 pump ,
though a DT1 pump would work too .

Yes, absolutely, the pumps all look pretty much the same from the outside from the very first in 1964 to the 1990's at least.  

But they are different inside and the internal gear must be the correct ratio for the worm gear on the shaft.  There were a bunch of different pump gear ratios.

Thanks for the replies. the add read " Genuine 1971 Yamaha DT1 250 Oil Pump Assembly 214-13101-04 RT3 DT3 DT2 1968-1973" and was purchased on ebay. I have reached out to the seller for a refund. I appreciate the help!!