VMS or DBM

Hi Friends,

I have gone through the online documentation..

http://help.sap.com/saphelp_dimp50/helpdata/EN/91/88c43ace7a3b46e10000000a114084/frameset.htm

I have come across the terms OEM, Importer and Dealer.

if example the Automobile Maufacturing Company wants to implement SAP.

1) Who is Importer here???

2) what we have to suggest..Whether VMS or DBM or Both..

Kindly guide me..

With Regards

Azeez.Mohd