According to an article in SearchAutoParts.com, technicians would rather call for parts than order them online.

Study: Shops & their techs prefer more traditional purchasing methods

Despite the convenience and ease of price comparisons, technicians are not looking for suppliers online to meet their parts needs.

Although the Internet is becoming a more and more commonly used source on a day-to-day basis in the shops, techs would rather deal with their parts suppliers in person or over the phone, rather than through an online website, according to the results of the Aftermarket Business World Online Behavior Study.