I don't know where you got that number from, but on Fram's website this is the info I got for the 193-84 Mitsubishi Diesel:
Part Number PH2921
Product Type Full-Flow Lube Spin-on

Anti-Drain Valve YES
Product Height 5.19"
Product I.D. 20mmx1.5mm Th'd
Product O.D. 3.72"
Relief Valve Setting PSI 12
Style Code 1


Applications Where Used



DODGE TRUCK
D50
4-2.3L Diesel (9) [1983]
4-2.3L Diesel Turbo (J) [1984]
Power Ram 50
4-2.3L Diesel (9) [1983]
4-2.3L Diesel Turbo (J) [1984]
Ram 50
4-2.3L Diesel (9) [1983]
4-2.3L Diesel Turbo (J) [1984]
FORD
Escort
4-2.0L Diesel (H) [1987-1984]
EXP
4-2.0L Diesel (H) [1987]
Tempo
4-2.0L Diesel (H) [1987-1984]
FORD TRUCK
Ranger
4-2.2L Diesel (P) [1984-1983]
MAZDA TRUCK
B-2200
4-2.2L Diesel [1984-1982]
MERCURY
Lynx
4-2.0L Diesel (H) [1987-1984]
Topaz
4-2.0L Diesel (H) [1987-1984]
MITSUBISHI TRUCK
Pickup
4-2.3L Diesel Turbo [1984-1983]
NISSAN KIZ
N-450
S-2B25
S-2B30
NISSAN KIZ-EXCAVATORS
N-450
S-2B25
S-2B30
PEUGEOT
505
4-2.3L Diesel Turbo [1986]
4-2.5L Diesel Turbo [1987-1985]
4-2.5L Diesel Turbo CAN [1988-1985]
WESTERBEKE
10BTD
12.5 BTDA
15.0 BTDA
WESTERBEKE (Marine)
15 BTDB
38B Four
W33A
WESTERBEKE-GENERATOR SETS
10BTD
12.5 BTDA
15.0 BTDA

Competitor Cross Reference

AC-DELCO PF1789
BALDWIN B7042
BECK/ARNLEY 041-8056
BECK/ARNLEY 041-8061
BECK/ARNLEY 041-8124
BECK/ARNLEY 041-8665
BIG A 92182
CARCARE OF2921
CARCARE OF4826
CARQUEST 85182
CASITE CF2921
CATERPILLAR 1N-4402
CENEX CO2811
CENEX CO2852
CHAMP PH2811
CHAMPION OF418
CHAMPION OF420
CHRYSLER MD013661
CITROEN LS483
CROSLAND 2053
CROSLAND 375
DEFENSE DL4816
DEUTSCH D433
DEUTSCH D571
DEUTSCH PH2811
DEUTSCH PH2852
DONALDSON P550158
FILTERS INCORPORATED OF2921
FLEETGUARD LF3369
FLEETGUARD LF3647
FLEETRITE LFR-83369
FORD E3TZ-6731-C
GRAND PRIX PH2852
GROUP 7 L20253
GROUP 7 L20287
GROUP 7 L34480
HASTINGS LF383
IAPCO A-0216-004
IAPCO A-0248-004
IAPCO OF905
INTERNATIONAL PARTS SERVICES 4-1112
IPD 10065
ITM 11-11102
ITM 11-11201
ITM 111-1201
JIFFY LUBE HL2921
JIFFY LUBE JL253
LAZORLITE L11-1309
LAZORLITE L11-1317
LUBER-FINER PH2811
LUCAS GIRLING F6568
LUCAS GIRLING F6598
MANN & HUMMEL W816/80
MANN & HUMMEL W817/80
MANN & HUMMEL W820
MANN & HUMMEL W840
MASTER PARTS PH-2852
MIGHTY L20287
MIGHTY PH2811
MINIT LUBE PH786
MITSUBISHI MD013661
MOBIL L20253
MOBIL L20287
MOTORCRAFT FL 813
MPA 2113
MPA 2115
MPA 2812
NAPA 1182
NISSAN 438-20005
PEUGEOT 110962
PURFLUX LS520B
PUROLATOR L20253
PUROLATOR L20287
PUROLATOR L34480
QUAKER STATE L20253
QUAKER STATE L20287
QUAKER STATE L34480
QUAKER STATE PO-126
SHELL L20253
SHELL L20287
SHELL L34480
VERA 10-01139
WAKO INDUSTRIAL LO-321K
WAKO INDUSTRIAL LO-823K
WARNER PH2811
WARNER PH2852
WESTERBEKE 35828
WIX 51182
WIX 51324