Your whirlpool washer was built in 1969. What are the symptoms of your machine? How competent is your repair person? Generally these machines need the drive system rebuilt when they reach this age and a lot of them before that. Most repair folks won’t touch a job like this these days. The part being referred to is the “wig wag” or control magnet. Whirlpool part numbers are 89814 for the kit including the plungers or 84867 for the wig wag only.