Will 1x8s work for my bed?

[jayoldschool]

My local hardware store has overstock Trex that they are going to give me for half price. Will dimesional 1x8s work for the wide planks? It measures .75" x 7.25" x 12' (same as wood lumber). GMCpaul's measurements call for 7 7/16" widths for the wide boards. I realize that there will be a bit of the board under the strips, but I measured my wide boards on my truck today, and the exposed wood between the strips is much less than 7".

Thoughts? Opinions? Anyone use 1x8s?

I also need to decide between grey and maroon (maroon would match the truck paint...)