I used to administrate Betefield DD in MTASA:Race. The maps then were hard to get a hold of then but fun to play (that's what brought the players back) I recently spoke to one an old MTASA:Race friend, he has a tonne load of old school MTASA:Race DD maps, however, they all need converting which is a painful task to do manually.
Converting MTASA:Race maps to the current format (with objects) is all good but it involves re-adding spawn points and pickups. I am not sure if there is a converter which does spawns, pickups and objects.
I am not sure if this website helps:
http://maps-for-mta.my1.ru/index/maps/0-6
Some of download links for the maps are dead but you might strike lucky.