Time for Garage clear-out one of several  A series rocker covers I have for sale. .

Aluminium after-market rocker cover, modified each end for 11 stud cylinder head use.

Also adapted with two breathers welded in. The longer elbow is 13/16" dia od (or 21mm approx these days) as is the rhs outlet.

The oil filler cap is threaded and lastly the fixing holes for the rocker cover are circa 9/16 dia (or 15mm approx)

Was used when we were Mini racing