I will give you two lists. The first is to show how many radios were in ANY type of Explorer in the model year 2002.
The second, only what was in the Sport Trac..
2 Dr (Sport), AM-FM-Cassette-CD, ID 1L2F-18C868-GA
2 Dr (Sport), AM-FM-Cassette-CD, ID 1L2F-18C868-GB
2 Dr (Sport), AM-FM-CD (6 disc, in dash), ID YL2F-18C815-FF
2 Dr (Sport), AM-FM-CD (6 disc, in dash), ID 1L2F-18C815-BA thru BD
2 Dr (Sport), AM-FM-CD (6 disc, in dash), ID 1L2F-18C815-LA
2 Dr (Sport), AM-FM-CD (6 disc, in dash), ID 1L2F-18C815-LB
2 Dr (Sport), AM-FM-CD (6 disc, in dash), ID YL2F-18C815-GD
2 Dr (Sport), AM-FM-CD (6 disc, in dash), ID 1L2F-18C815-MB
2 Dr (Sport), CD changer, ID 1F1F-18C830-AA
2 Dr (Sport), CD changer, ID XW1F-18C830-AB
4 Dr, Sport Trac, CD changer, ID 1F1F-18C830-AA
4 Dr, Sport Trac, CD changer, ID XW1F-18C830-AB
4 Dr, exc. Sport Trac; CD changer, ID 1F1F-18C830-AA
4 Dr, exc. Sport Trac; CD changer, ID XW1F-18C830-AB
4 Dr, exc. Sport Trac; AM-FM-Cassette; ID F87F-19B132-AA
4 Dr, exc. Sport Trac; AM-FM-Cassette; ID F87F-19B132-AB
2 Dr (Sport), Amplifer, ID 2L2T-18B849-AB
2 Dr (Sport), Amplifer, ID 2L2T-18C808-AB
4 Dr, Sport Trac, Amplifer, ID 2L2T-18B849-AB
4 Dr, Sport Trac, Amplifer, ID 2L2T-18C808-AB
4 Dr, Sport Trac, AM-FM-Cassette-CD, (ID 1L2F-18C868-GA)
4 Dr, Sport Trac, AM-FM-CD (6 disc, in dash), ID YL2F-18C815-FF
2 Dr (Sport), AM-FM-CD (sgl disc), ID 1L2F-18C815-HA
4 Dr, Sport Trac, AM-FM-CD (sgl disc), ID 1L2F-18C815-HA
4 Dr, Sport Trac, AM-FM-CD (6 disc, in dash), ID 1L2F-18C815-BA thru BD
4 Dr, Sport Trac, AM-FM-CD (6 disc, in dash), ID 1L2F-18C815-LA
4 Dr, Sport Trac, AM-FM-CD (6 disc, in dash), ID 1L2F-18C815-LB
4 Dr, Sport Trac, AM-FM-CD (6 disc, in dash), ID YL2F-18C815-GD
4 Dr, Sport Trac, AM-FM-CD (6 disc, in dash), ID 1L2F-18C815-MB
2 Dr (Sport), AM-FM-CD (changer button), (ID 2L2T-18C815-DA)
2 Dr (Sport), AM-FM-CD (sgl disc), ID 1L2F-18C815-GA
2 Dr (Sport), AM-FM-CD (sgl disc), ID YW7F-18C815-AA
4 Dr, Sport Trac, AM-FM-CD (sgl disc), ID 1L2F-18C815-GA
4 Dr, Sport Trac, AM-FM-CD (sgl disc), ID YW7F-18C815-AA
4 Dr, Sport Trac, AM-FM-CD (6 disc, in dash), ID 1L2F-18C815-EB thru ED
4 Dr, Sport Trac, AM-FM-CD (6 disc, in dash), ID 3L2T-18C815-MB
4 Dr, Sport Trac, AM-FM-CD (6 disc, in dash), ID 4L2T-18C815-GA
4 Dr, exc. Sport Trac; AM-FM-Cassette-CD (sgl disc), ID 1L2F-18C868-BB
4 Dr, exc. Sport Trac; AM-FM-Cassette-CD (sgl disc), ID 2L2T-18C868-DB
4 Dr, exc. Sport Trac; AM-FM-Cassette-CD (sgl disc), ID 3L2T-18C868-DC
4 Dr, exc. Sport Trac; AM-FM-Cassette-CD (sgl disc), ID 4L2T-18C868-DA
4 Dr, exc. Sport Trac; AM-FM-CD (6 disc, in dash), w/Audiophile, ID 1L2F-18C815-BA thru BD
4 Dr, exc. Sport Trac; AM-FM-CD (sgl disc), ID 1L2F-18C815-GA
4 Dr, exc. Sport Trac; AM-FM-CD (sgl disc), ID YW7F-18C815-AA
4 Dr, exc. Sport Trac; AM-FM-CD (6 disc, in dash), w/o Audiophile; ID 1L2F-18C815-AC, AD and AE
4 Dr, exc. Sport Trac; AM-FM-Cassette; ID 1L2F-18K876-DD
4 Dr, exc. Sport Trac; AM-FM-Cassette; ID 1L2F-19B132-AA
2 Dr (Sport), AM-FM-Cassette-CD, ID 2L2T-18C868-BA and CA
2 Dr (Sport), AM-FM-Cassette-CD, ID 3L2T-18C868-BA
4 Dr, exc. Sport Trac; AM-FM-CD (sgl disc), ID 2L2T-18C815-JA
4 Dr, exc. Sport Trac; AM-FM-CD (sgl disc), ID 3L2T-18C815-UA
4 Dr, exc. Sport Trac; AM-FM-CD (sgl disc), ID 2L2T-18C815-FA
4 Dr, exc. Sport Trac; AM-FM-CD (sgl disc), ID 3L2T-18C815-UB
Here is what was available to the Trac only,
4 Dr, Sport Trac, CD changer, ID 1F1F-18C830-AA
4 Dr, Sport Trac, CD changer, ID XW1F-18C830-AB
2 Dr (Sport), Amplifer, ID 2L2T-18B849-AB
2 Dr (Sport), Amplifer, ID 2L2T-18C808-AB
4 Dr, Sport Trac, Amplifer, ID 2L2T-18B849-AB
4 Dr, Sport Trac, Amplifer, ID 2L2T-18C808-AB
4 Dr, Sport Trac, AM-FM-Cassette-CD