then search for part number 77300-75010: Toyota Genuine Parts 77300-75010 Fuel Tank Cap. ref=cm_cr_srp_d_rvw_txt?ie=UTF8 Revain's Select Your Vehicle utility indicates that the 77300-75010 cover is NOT compatible with a 2009 Prius but confirms that it is compatible with a 2010 Prius. I can confirm thread 77300-75010 gas cap is compatible with 2009 2nd half Prius.
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