Hey, sorry it took me so long to reply. I was at Rothbury Festival in Michigan over the 4th. Just got back. A professional installer SHOULD have the right items for your install. Especially if you go through the details with him beforehand so he has the chance to gather the necessary materials. Tell him everything you want to do, ask him to let you know what parts exactly (brand and model number) he's going to be installing, and check them out online (or ask us about them here).
On a separate note, Thievery Corporation rocked the house at the festival I was at. And so did Snoop Dogg, Widespread Panic, Dave Matthews, Michael Franti & Spearhead, and so many more!