Brunning,
Sadly I had the same thing happen to me, it was a real pain and I eventually contacted the seller, Ben's Bike, and they asked for a few pics and I sent them in and got replacement ones free. What I did differently when I put the new ones on was file the holes the straps go through on the pedals (I have Sylvans as well) so there was more room and they fit much better and didn't split. Perhaps if you file it and try to glue them they'll work. Good Luck!