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