PART NO.  SPL.PAGE  DESCRIPTION                                                           
MB19556   15.R.14   Buffer assembly -door (4) -(door fittings, 1500 Tourer) -(2 for 1500 Coupe)
MB19556   TC.R.13   Buffer assembly -door (4) -(door fittings, Twin Cam Tourer) -(2 for Coupe) 
MB19556   16.R.14   Buffer assembly -door (4) -(door fittings, 1600 Tourer) -(2 for 1600 Coupe) -
    -changed to AAA5115
AAA5115   16.R.14   Buffer assembly -door (4) -(door fittings, 1600-MK-II Tourer) -(2 for Coupe) -
    -was MB19956
AHH6273             Buffer -door -(4) for MGA roadster, (2) for MGA Coupe
AHH6273             Buffer Assembly -door -(4) for MGA roadster, (2) for MGA Coupe
AHH6273K           Tapping Plate and Screw -door buffer -(4) for MGA roadster, (2) for MGA Coupe
AJD2245Z  15.R.14   Screw fixing buffer to body (4) -(door fittings, 1500 Tourer)
AJD2245Z  16.R.14   Screw fixing buffer (4) -(door fittings, 1600 and 1600-MK-II Tourer)
AJD2245Z  TC.R.13   Screw fixing buffer (4) -(door fittings, Tourer, Twin Cam)

AJD2245Z Screw  
AHH6273K Tapping Plate
AHH6273   Buffer for MK-II cars

These part numbers will be confusing. Initially, the Service Parts List books do not identify a separate part number for the insert tapping plate. It does identify a MB19556 Buffer Assembly, which is a set of multiple parts. Then the assembly number changed to AAA5115. There are also part numbers AHH6273 and AHH6273K for the buffer and the assembly (where "K" may refer to "Kit"), but these numbers are not in the SPL books for MGA. They may be early production MGB part numbers. Also after market parts vendors seem to use these part numbers interchangeably, so it may be difficult to know what you may get without pictures. So do ask questions before ordering parts.

The original tapping plate was a steel part, possibly zinc plated. Modern replacement tapping plates are often aluminum material, which promotes galvanic corrosion, and may be impossible to disassemble in the future. The screw was originally 2BA x 5/8" long raised countersunk Phillips head. That head size is smaller than the head of a #10-32-UNF screw, so both the thread and head of replacement screws (as well as replacement tapping plates) may be inappropriate for this application.