[Plugin: Contact Form 7] drop down list

Hi all,

I’ve been looking for a plugin that could do what this one does: drop down lists -but for a contact form-, with subcategories for those lists (mark->model…). I thought Contact Form 7 could do the trick, but apparently no.

Example: https://www.urparts.com/index.cfm/page/entermachinedetails/categoryId/1/isBuyer/true/

Any ideas or names of plugins which could do that or if CF7 can be upgraded/edited in order to do that?

Thx in advance!