1972 DT2 250 
Oil pump leaking near cable shaft area. 
I found a few pumps on eBay they give a part number SL292....... How can I reference that number or better what is the part number for my bike ? 
anyone have a good pump? 

Hi , I had a similar problem with my oil pump . it leaked more oil than it pumped. it is quite an easy repair job really. firstly remove the pump from the bike insert a 6mm bolt into the main oil line pipe so it wont loose all the oil. remove the nut and washers take pics of positions of these. remove 4 pozi screws and split the pump open . replace the oil seals , measure them with digi calipers and order new seals off internet . reverse this process to rebuild. after refitting main oil feed bleed the pump using the plastic wheel to purge any air from the pump system. good luck.

Don't forget to bleed your pump up after.