got a awesome deal on them and got them...will they work with afmarket 19s and anything else i need to know

horrible idea

Your best bets are 245/35/19 or 255/35/19. These will give you the closest specs to OEM.

if you have a sedan that size is right on!

will 255s fit on the front wheels? seems like it might be too wide for that rim

I run a 245/40/19 up front on a sedan (won't do it again). It doesn't look very good at all, but it doesn't rub if you aren't to low so if you don't care about looks go for it.