I finally got my side repeaters for the D1 in the mail today too.
Dunno about the Defender, but the D1 gives very little room for some LED T10 designs. The length of the bulb is the critical bit.
This type:
sku_51356_1.jpg
is no good for the D1, but fits in the D2 no problems.
D1 needs this type:
sku_51106_1.jpg
Note the difference in length from the bulb end of the base to the tip of the LED .. very short.
The D1 bulb is inserted at 90° to the holder and a long LED chip type tops out on the plastic lens.
The D2 bulb is inserted on a 45° angle, so that longer design(up to a point tho!) fits a bit easier. 
They're a little bit less bright than even the 5W T10 globes they replaced, but still clearly visible in daylight, so shouldn't come up as a topic of conversation with the law enforcement establishment.
And now my trailer turn indicator light has finally completely vanished.
				
			 
			
		 
			
				
			
			
				Arthur.
All these discos are giving me a heart attack!
'99 D1 300Tdi Auto ( now sold :( )
'03 D2 Td5 Auto
'03 D2a Td5 Auto
			
			
		 
	
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