3/25/19
Hi everyone, just some quick fyi, for 1973 250 trans bearings, parts manual mainshaft & countershaft-split needle cage bearings p/n K21x25x13D are available from KTM-current p/n is 0405212513 $10.34;
countershaft K25x29x10 current KTM p/n-0405252910 $5.98;countershaft K20x24x13 current KTM p/n 0405202413 $7.77.
I just bought some from KTM World.com and they had them in stock.
Hope this helps, take care, have fun and ride forever!
Richard