Question about Ebbro and UT Models

ok i just recently got 5 ebbro cars from my girlfriend two integra type r's (one old silver and one new blue), white mugen S2, and two GT-R's (R33 purple and R34 V-Spec II Blue). if you want pictures i will post them later. but the question is How do you know what number you have? i know some say one of 3000 and some just say the name of the car. also do UT Models have carpet? since there a branch of autoart. and i also got some new autoart models rx 8, fairlady z z33, and is300. i will post pics later. thanks