For everyday (and night) use, I wouldn't bother- Mine came with square lights originally.
They were shite. Especially compared to the round halogen ones I've got now.
I'm not sure if you can get new ones or not, but I'm pretty sure you can't upgrade them at all (they're sealed units) so that's why I went for round (plus I preferred the round look)...
Could be wrong, but hope that helps