Customize ask a question button from joomla VirtueMart

Hello there I have a customer who wants to use virtue art without the cart - as a product catalogue. He needs to create 2 custom fields inside VM, one for size and one for color. So, when he has a product, the user can see in front end the product and also those 2 fields to see the available colors and sizes. All this can be easily down inside VM. In front end there is a ask question about this product. I need to add those 2 custom fields inside the ask question about this product form, but as drop down fields, so the user selects the color and size he is interested in from the ask question form and I receive the info? Conclusively, the user creates from VirtueMart (joomla 2.5) 2 custom fields: Size and Color. Then if he wants, he adds those fields inside some products. For the products, he adds those fields and gives values for color field and size field. So, for these products, i want when the visitor clicks on Ask for this product button, to pull those 2 custom fields (drop-down) inside the ask question form and then the visitor fills in the other field and selects from the 2 drop-down fields the size and the color of the product he is interested in and the admin receives the drop-down info also through e-mail. The fields in the form must be pulled from each item. So, if i have 2 items that have different color and size options then i won't have a problem