i would suggest you (shop around) for that walking foot for your machine---the reason i say this is because when i first bought my (new machine) i took a class & needed a walking foot---called the dealer & they said-why of course---it's $89.95---i bought it
about 2 months later i saw one at a shop (the real one for my machine) for $12.95!!!
i would not use generic feet on my machine- repairs are much more costly than the tools made for it- but i do now always shop around- pretty much never buy anything i need from the dealer.