A Fisher & Paykel washer should use only Fisher & Paykel parts. Like many manufacturers, Fisher & Paykel uses proprietary technology in its product design. Genuine Fisher & Paykel parts are available via its online store at fisherpaykel.com.
Fisher & Paykel's website describes the industry-first technology that they use in the design of their washers. However a 2013 Consumer Reports study among owners of Fisher & Paykel washers between 2008 and 2012 cites them as one of the most repair-prone top-load washer brands. Fortunately, it's not difficult to find repair parts. Websites like genuineapplianceparts.net may provide parts at a discounted price.