Brother 1500 walking foot with guide
 

Does anyone know where I can get a walking foot that is compatible with my Brother 1500 that has a guide? I mainly do straight line quilting and I'd love to have a guide so I don't have to mark my quilts anymore. I've searched all over the internet, but have not yet found something that is compatible with my machine.

Or is there a suggestion on how to make a homemade guide work on the walking foot that came with the machine?