I have Brother machines. I found an open toed foot that has the same size prongs on each side. To get my quarter inch on the right, I use the left needle setting and then come back .5. That lines me up so that I am running the edge of the fabric on the inside of the right prong. That way I can look at the fabric all the way to the needle. I would think that it would work the same by using a needle left setting and use the inside of the left size of the open toes foot.
This is the more expensive Brother labeled foot similar to the one I bought which was a generic and would fit multiple machines. I don't like plastic, because I can't always see it that good for lining material up.
http://www.ebay.com/itm/Brother-SA18...item51901cf452
You might have this foot. It is for a Pfaff and is a 9mm.
http://www.ebay.com/itm/9mm-Open-Toe...item232cc056c4
Or this one which is for a Pfaff and is a 6mm. FYI...I don't have a clue what mm mine is.
http://www.ebay.com/itm/6mm-Open-Toe...item232cc056c6