There are 2 drawings for part 68 available in AirCorps Library

Manufacturer's Drawing

North American Aviation,   P-51C and P-51B Parts Catalog,   Page: --,   Revision: n/a  

Associated Aircraft:   P-51  

Manufacturer's Drawing

North American Aviation,   Parts Catalog for P-51D,   Page: --,   Revision: n/a  

Associated Aircraft:   P-51