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Thanks Anita! The manual only references WY21W bulb size, but I did read somewhere that this was equivalent to 7440 bulbs; thanks for confirming this. Also, good to know that STEALTH will do a quick compatibility check before processing the order.
The Sylvania website says 7440A for the blinker bulbs. That's a good place to check. Not to add to your confusion, I have Stealth 3457 in the front blinkers and Philips SilverVision WY21W in the back blinkers. They are the same bulb size (WY21W) in the 350, but not in the 450h with LED headlights. I found out the hard way Well, on the bright side (no pun intended) I have replacement bulbs if the rear blinkers go out. So far so good on both sets.