alternative to o-rings for cx7 fuel injectors?
 

I have a 2008 Mazda CX-7 2.3 turbo Grand touring. I need to replace the upper and lower o-rings on the fuel injectors L3K9-13-352 (lower) and L3M8-13-252 (upper) Dealer has them for $33.52 each and $4.13 each. Expensive little washers! I cannot find any after market products or nothing lower than about $25 each. Do I have to replace them with exact same or is there alternatives? Is there a cheap place to buy these as OEM?