A B757 CREW; ON APCH TO MHR; HAD AN NMAC WITH A LIGHT HIGH WING ACFT.

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WE WERE ARRIVING AT MHR. CLRED FOR AN APCH AND CLRED TO LAND ON RWY 22L. WE WERE APPROX 9 MI FROM THE RWY WHEN WE HEARD AN ACFT CALL IN (I THINK 4 MI L BASE). THE TWR CLRED THE ACFT TO LAND RWY 22L. THE TWR ADVISED THAT ACFT OF OUR APCH. I AM NOT SURE IF THE TWR ADVISED US OF THE TFC; HOWEVER; THE TWR DID NOT EVER GIVE A TA IN POS AND DISTANCE. WE WERE CONCERNED ABOUT THE TFC. VISIBILITY WAS 10 MI; BUT WE WERE LOOKING INTO THE SUN AND DID NOT SEE THE RWY TILL ABOUT 4 MI OUT; WE NEVER DID SEE THE TFC. AT ABOUT 3-4 MI OUT; WE HEARD AN ACFT CLRED TO LAND ON RWY 22R. WE DID NOT KNOW IF IT WAS THE SAME ACFT. WHEN WE CLRED THE RWY SOMEONE ASKED IF WE SAW THEM AND THAT WE PASSED OVER THEM BY ABOUT 150 FT. WE RESPONDED THAT WE DID NOT. CONTRIBUTING FACTORS: MHR TWR DOES NOT HAVE RADAR. WE ARE ALWAYS KEPT HIGH ON ARR FROM THE E; CAUSING US TO BE HIGH AND FAST ON ARR AT MHR. SUGGESTIONS: I HAVE HAD SIMILAR EXPERIENCES AT MHR. THE TWR ACCEPTS VFR TFC WITHOUT BEING SEQUENCED BY SAC APCH. THE TWR DOES NOT KNOW EXACTLY WHERE THE TFC IS. MHR TWR NEEDS RADAR AND SHOULD NOT EXCEPT TFC NOT SEQUENCED FOR ARR BY APCH CTL.