This NOS Original Equipment LH Lower Suspension Arm according to the BL Microphiche fits


Austin Morris 1800 Mk 1 


Wolseley 18/85 to C/N W 175 7959A


The Microphiche lists a later arm BTB 1231 which is the number shown on the casting in photograph 3.  Although it shows as No Longer Available it states this later part number fitted the following later vehicles


Wolseley C/N W 175 7960A to 14493A


                 C/N 217S 101A to 101361A


                 C/N 2W 175 101A to 22301A

                 
                 C/N 217S 102001A onwards

 
                  C/N 2017S 101A onwards


                  C/N WD175 101A onwards  


So could this part be used on the whole range or was there a machining difference? I don't know so in the absence of knowledge this part is offered on the basis of the above information and a purchase is an indicatation that you have read it and have taken responsibility for it in respect of your car.  So if anyone reading this knows the answer I would be interested to hear from you please