That bit is part of the front panel and you should have a bracket under each headlight
As long as you have the crash bar on there it should be fine to drive and it's not safety related I will just log back into parts link and see if I can get a rough price for you
So from what I have found from my chassis number 2005 gtiPart number 1k0805588sAnd price on parts link which I believe we use for tps is £230.76From the damage you described I wouldn't have thought so but it depended where it was hit and how hard buddy