It all depends on your particular model machine.
Found on the internet, Low Shank vs High Shank:
"When presser foot is down, measure the distance from the bottom of foot to screw-hole that holds the foot onto the presser bar. Singer slant is for slant needle machine only. A high shank machine measures approximately 1 1/4" from the screw to the bottom of the foot."
http://www.sewingpartsonline.com/pfaff-sewing-machine-presser-feet.aspx Pfaff Presser Feet
You may be able to use snap-on feet if you can first buy the shank adapter for your machine. You can buy a whole kit of 10 or more different snap-on feet that you would be able to use with the adapter shank.
Buying brand-name accessories could get very expensive. Some believe the generics or snap-on are inferior, but that is a matter for the owner to determine after deciding how much the accessories will be used. Personally, the snap-on feet I've used serve their purpose. If I am using a foot very frequently, I will consider buying the brand-name because the quality is usually better.
You'll need to determine what shank your machine has and whether these feet will work on your machine. Frequently, you can find accessories on eBay.
Here's an example of an adapter for low shank: Generic Snap On Low Shank
http://www.thecolorfulworldofsewing.com/Pfaff-Presser-Feet/ 11 Piece Snap On Presser Foot Set 15 Piece Presser Foot Set with Walking Foot
32 piece: http://www.thecolorfulworldofsewing.com/32-Piece-Presser-Foot-Set-with-Bonus-Needle-Threader.html
In case you need it, here is a manual for your machine: