[jacoba]

I have an older Smooth Fitness Spinning Bike Model # V350.  I am looking for pedals that I can clip into.  I purchased three different clip in pedals from Amazon and they didn't fit the threading of the pedal arm.  Its like the hole is too small for the pedal to screw on.  Is there a special size or special pedal that I need to use and where can I find it.  

They seem to not make this model any longer so the manufacturer has no options for me.

I found this website www.fitnessrepairparts.com but they have a 20% restocking fee for returns.  I don't want to purchase the ones they have and then be penalized if they don't work.

Any help?