These are "Stat-O-Seal" washers made by Parker, good for sealing under hex nuts and bolt heads. The chart shows common materials, sizes and part numbers for parts that may be useful for your MG. Some applications may be tappet covers, Twin Cam Valve covers, gearbox side cover.
Find complete catalog on the Parker web site - (0.7-MB pdf file).
These are "Stat-O-Seal" washers made by Parker, good for sealing under hex nuts and bolt heads. The chart shows common materials, sizes and part numbers for parts that may be useful for your MG. Some applications may be tappet covers, Twin Cam Valve covers, gearbox side cover. 
