Hi there. Welcome to the forum .
I have a Shipmate stove as well, a three burner with oven
model., mine is all working , knock on wood . I think you can source the parts you need from any gas guy they used all Robertshaw components as far as i know . So if you take your broken part to a someone that carries Robert Shaw products you may be in luck .
I was really thinking about updating my stove but it works just fine so why fix what ain't broke .
Good luck , keep us posted