the rebirth drums are just samples. just get some 808 and 909 kits.
if you want to use the 303 sounds in Reason there are a couple of ways. first you could just remake the 303 sound in any of Reason's synths and program using the matrix. the original 303 obviously wasn't that complicated but replicating its filters is very tricky. but you can get a decent emulation. but if you want that "rebirth" sound (which does have it's own sort of gritty digital character) then you can use the rebirth input machine in reason.
i assume you already have rebirth? if not just google it and download it from megaupload or **********. i don't feel bad about telling you this as propellerheads already released the program for free but the official torrent for the program is down. if you're on windows 7 it's a bit complicated to mount it. i can't remember the exact steps but i think you have to right-click on properties and run the program in Vista SP3 mode. if you're on Mac then you can't run the program at all.
once you have the rebirth up and running you can now use it in reason. open reason, add a rebirth input device to your rack and then open rebirth. if you flip the rack around you will see there are inputs and outputs for the individual instruments from rebirth. unfortunately rebirth cannot be sequenced from reason.
tbh it's a huge pain to do any of this. if i want that acid sound i usually just try to recreate it in thor or i use one of the 303/rebirth combi's that are out there.