To confirm fitment of your Pre-Air filter I suggest you check the cross reference info below and also the specifications (size)
 

Specifications
Filter Material    Cotton Gauze
Height    6 in (152 mm)
Inside Diameter    5.25 in (133 mm)
Outside Diameter    6.25 in (159 mm)
Top Style    Open
Top Material    None
Air Filter Shape    Round
Flanges    None
Package Contents    1 Air Filter
Washable    Yes
Weight    0.9 lb (0.4 kg)

Product Box Height    7.25 in (184 mm)
Product Box Length    6.5 in (165 mm)
Product Box Width    6.5 in (165 mm)
 

Cross reference
Ryco HDA5783
Repco RAf99
Silver AF99SL
OEM U3401

FORD MAVERICK DA 4.2L TD42 OHV 12v Diesel Inj. 6cyl
91kW 5sp Man 4dr Wagon 4WD [02/88 - 09/93]    

NISSAN PATROL WRGY60 Y60 (GQ) 4.2L TD42 OHV 12v Diesel Inj. 6cyl
91kW 5sp Man 2dr Cab Chassis & Pickup 4WD [01/87 - 12/97]    
91kW 4sp Auto 2dr Wagon 4WD [02/88 - 01/95]    01/94 -12/96
Outer Diameter: 154mm; Secondary Filter
91kW 4sp Auto 4dr Wagon 4WD [01/89 - 12/97]    
01/94 -12/96 Outer Diameter: 154mm; Secondary Filter

91kW 5sp Man 4dr Wagon 4WD [01/89 - 12/97]    
01/94 -12/96 Outer Diameter: 154mm; Secondary Filter

91kW 4sp Auto 4dr Wagon 4WD [01/87 - 12/97]
91kW 5sp Man 2dr Wagon 4WD [01/87 - 12/97]
91kW 5sp Man 4dr Wagon 4WD [01/87 - 12/97]
91kW 5sp Man 2dr Cab Chassis 4WD [01/87 - 12/97]

NISSAN SAFARI WRGY60 Y60 (GQ) 4.2L TD42 OHV 12v Diesel Inj. 6cyl
91kW 4sp Auto 4dr Wagon 4WD [08/93 - 12/97]
91kW 5sp Man 4dr Wagon 4WD [02/91 - 12/97]
91kW 4sp Auto 2dr Hardtop 4WD [08/93 - 12/97]
Secondary Filter To Suit Dual Systems

NISSAN SAFARI WRY60 Y60 (GQ) 4.2L TD42 OHV 12v Diesel Inj. 6cyl
91kW 4sp Auto 3dr Wagon 4WD [01/91 - 12/94]    
Secondary Filter To Suit Dual Systems
6cyl 91kW 5sp Man 2dr Wagon 4WD [02/91 - 12/97]    
Secondary Filter To Suit Dual Systems
6cyl 91kW 5sp Man 3dr Wagon 4WD [01/91 - 12/94]    
Secondary Filter To Suit Dual Systems