Automotive product description rewrites to include images.

Please provide cost per X amount of words and time frame to rewrite automotive accessory product descriptions to include images placed in or around the area. The column space I have to work with is about 430 pixels - 450 pixels wide. I need at least ten rewrites of around 300 - 500 words each. I may break this down into 20 or so smaller rewrites. I don't have an exact number, but I will demonstrate what I mean in PM board. I will provide images and and original manufacturer product descriptions. The default product descriptions I have may be as high as 500 - 800 words each. Feel free to rewrite and include whatever you think gets the point across without being too wordy. Important info must be at the top. I am asking for cost per X amount of words because I am not sure how many descriptions will be written as of yet.