Identify crown wheel (ring) & pinion set

ESSX28-1

Can anyone tell what this crown wheel (ring) & pinion  set fit?    305407J  The pinion has 9 teeth & crown wheel (ring) has 41 teeth.

thanks

Lance

Thats the overdrive rear end ratio from 48-54. Depends if it was on a 48-51 rear or 52-54 rear . . Don't know about the 'J' suffex though. Somebody else may know.