Try Mike Murphy. He's a Canadian, good with cars and very friendly. Mike even has a website
, although you won't find much useful information there
But I managed to find his address somewhere else. Here you go:
LAO CAN-AM Int'l Auto Services Co., Ltd
Ban Phonesinuan, Sisattanak District. P.O. Box 8587. Vientiane, 01000 Lao PDR.