978 ELNA, NECCHI variklio dirželis, 250,8mm (250L)
- 250,8mm ilgio (9-7/8″)
- 5,5mm plotis
- Trapecinis
Tinka šiems modeliams:
ELNA, ELNITA – 110, 120, 130, 140, 150;
NECCHI – 523, 531, 534, 535, 536, 537, 885, 887;
RICCAR – 706, 707;
WHITE – 423, 447-Small, 80.
Alternatyvūs dalies numeriai – DMB-250, 10388, 250L, 395’523-55, 395523-55.