GM Daewoo Auto & Technology Co said on Tuesday at least three vehicle makers were interested in buying the Daewoo Motor commercial vehicle unit, which was excluded when General Motors bought the ailing South Korean firm last year, according to Reuters. "We plan to send a letter of invitation to potential bidders next month and we are at the moment talking with three local and foreign companies to sell the unit," a Daewoo spokesman told Reuters, though he would not identify the potential buyers.