Looking through the KTM side of Ebay and ran across some Penton motors, barrel and head.
Item numbers are:
2465213430 Black motor, not sure of size, ends 3/13 @ 18:38pst (73)
2464380757 250 barrel, 71mm bore, ends 3/9 @ 18:12pst
2464384149 250 head, black, ends 3/9 @ 18:23pst
2465433726 400 bottom end w/piston, ends 3/14 @ 17:16pst (76 motor)
Rocket