Turn signals listed as 7440? perhaps its a cross-reference, but I've always used 1156 bulbs in the front and back turn signals with no problems.
Also, if you go LED turn signals and have the factory blinker in the car, they will go nuts, as in flash rapidly as if a bulb was burnt out. (Even two LED 1156s wont total the power use of one filament 1156)
You can get a heavy duty flasher, electronic. And be very adamant about getting the right flasher at auto zone or wherever you go. the Advance Auto down the street sold me the incorrect flasher (3 pin, but I beilve it was an older, 3 pin external load type flasher),anyway it nicely burned up a wire in a harness way behind the dash "well sir, we cant do anything about that.." I fixed the turn signals, but to this day I still don't hazard function.