sorry for late reply guys. I was away for the past 2 days.
I do think those are INF but as scanlan said, INF have hex screw (I have 'em on my 2003 RGT42). Earlier INF maybe?
I dont really know the exact year of the guitar but it could be between 2000-2001. Browsing thru
ibanez parts list, revealed these part number for RG450LTD:
PICK UP (FRONT) 3PU1 J1 1 B1
PICK UP (CENTER) 3PU1 J2 1 B2
PICK UP (REAR) 3PU1 J1 1 B2
2003 RGT42 (korean) with INF1 & INF2 have these part number:
PICK UP (FRONT) 3PU1C3034R
PICK UP (REAR) 3PU1C3044
A 2003 RG1570 with V7 & V8 have these part number:
PICK UP (FRONT) 3PU1J1V7B1
PICK UP (CENTER) 3PU1J1S1B2
PICK UP (REAR) 3PU1J1V8B2
Earlier V7 & V8 share the same part number as above.
A 2000/2001 RG450AH (Japan) have these part number:
PICK UP (FRONT) 3PU1J11B3
PICK UP (CENTER) 3PU1J21B4
PICK UP (REAR) 3PU1J11B4
A 2001 RG350LTD (Japan) have these:
PICK UP (FRONT) 3PU1J11B3
PICK UP (CENTER) 3PU1J21B4
PICK UP (REAR) 3PU1J11B4
So, I come up with a conclusion that :
3PU1 J1 1 B1 = INF1 (Japan)
3PU1 J1 1 B2 = INF2 (japan)
3PU1J11B3 = INF3 (Japan)
3PU1J11B4 = INF4 (japan)
those pickups with 'C' in it could be made in korea or china (new INF and Powersound have 'C' in the part number)