The change was done during MY03 model run. If I can find the VIN I'll add it here.
No, I no longer have a copy of the TSB that notes the D2 & Defender VINs but here's a link to it pon another site.
www.landroverclub.com.ar • Ver Tema - Reemplazo de pines plasticos por metalicos en Td5 - boletin
TECHNICAL BULLETIN NO: 0011 ISSUE: 1 PAGE: 1 OF 1
TECHNICAL BULLETIN
MODEL / DERIVATIVE: Bulletin No: 0011
Discovery Series II (LT) CDS. ref: L8821bu
Defender (LD) Issue: 1
Date: 20.11.02
AFFECTED RANGE:
All Td5 derivatives within VIN ranges:
Discovery Series II
(02 Model Year)
2A 736340 to 3A 793895
Defender
(02 Model Year)
2A 622424 to 3A 647705
SUBJECT:
CYLINDER HEAD LOCATING DOWELS
DETAIL:
Td5 engines fitted to vehicles in the above VIN range are fitted with plastic dowels
to locate the cylinder head onto the cylinder block.
Land Rover Engineering has introduced steel locating downs from the following
VIN numbers:
Discovery Series II: 3A 793895
Defender: 3A 647705
INFORMATION:
If a cylinder head is removed from a vehicle in the above VIN range, the plastic
dowels must be replaced with new specification steel dowels, which are now
available from Land Rover Parts.
CAUTION: Td5 derivatives prior to the above VIN range must not, under any
circumstances, be fitted with the new steel dowels. If steel dowels are fitted to
earlier engines, cylinder head cracking may result.
PARTS INFORMATION:
Part number Description Qty / Veh
LVB000240 Gasket - cylinder head - 2 holes (1.20mm) 1
LVB000250 Gasket - cylinder head - 1 hole (1.27mm) 1
LVB000260 Gasket - cylinder head - 3 holes (1.35mm) 1
ERR5384 Bolt - cylinder head 12
YLL500040 Steel dowel 2 
