I just purchased these bulbs on Amazon and they are incredible. Super bright. The funny thing is they say they are not made for 2007 SC430.
LUYED 2 x 360LM Super Bright 3014 30-EX Chipsets Lens BA9 BA9S 53 57 1895 64111 LED Bulbs Used For Side Door Courtesy Lights Map Lights,Xenon White

Please post the link for the seller.

this

this

in the question and answer section, it states these are not reversed polarity. So this particular one won't work.

One other thing, do not try to reverse the wires to make it work. It won’t. The map light switches involve other functions.