A B737-700 L ENG COWLING WAS DAMAGED AS THE ACFT WAS MARSHALED INTO A JETWAY AFTER A WING WALKER'S STOP COMMAND WAS NOT OBSERVED.

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ARRIVED INTO ANCHORAGE AND TAXIED IN TO GATE. AS WE PROCEEDED IN TO THE GATE SAFETY ZONE; ALL ITEMS WERE OBSERVED TO BE CLR ON BOTH THE R AND L SIDE OF THE ACFT. WING WALKERS WERE ON EACH WING AND A LEAD MARSHALLER WAS LOCATED ON THE TAXI LINE DIRECTLY IN FRONT OF THE AIRPLANE. THE JETWAY WAS PARKED IN ITS SAFETY BOX AND A NORMAL TAXI IN WAS ACCOMPLISHED. THE ACFT WAS PARKED EXACTLY ON THE RAMP SPOT LABELED 'MD80; B737-700/800.' AFTER SOME TIME ELAPSED AND THE JETWAY WAS NOT BROUGHT UP TO THE ACFT; I OPENED UP THE COCKPIT SIDE WINDOW AND LOOKED TO SEE WHAT THE DELAY WAS. I NOTICED THE JETWAY WAS VERY CLOSE TO THE #1 ENG AND THAT THERE WERE SOME RAMPERS POINTING AT THE JETWAY. WE HAD APPARENTLY BEEN MARSHALED INTO THE JETWAY. WE SAT THE PEOPLE DOWN AND THE RAMP PERSONNEL USED A TUG TO PUSH US AWAY FROM THE JETWAY. THE JETWAY WAS BROUGHT UP TO THE AIRPLANE AND THE PAX DEPLANED NORMALLY. IN A POST EVENT DEBRIEF WITH THE MGR OF GND OPS; IT WAS NOTED THAT THE JETWAY HAD BEEN SET FOR A B737-400 INSTEAD OF A -700. APPARENTLY; EVEN WITH THE JETWAY IN ITS SAFETY BOX IT COULD STILL HIT A -700. IT WAS ALSO RELATED AT THIS TIME; WHEN I ASKED WHY THE WING WALKER HAD NOT SEEN THIS COMING AND STOPPED US; I WAS TOLD HE HAD SIGNALED THE EMER STOP TO THE LEAD MARSHALLER; BUT THE LEAD DIDN'T SEE THE SIGNAL BECAUSE HE WAS WATCHING THE NOSEWHEEL.