I have found in my 2015 XC70 that the LED replacements with cooling fan, which you definitely want, interfere with the re-installation of the dust cap behind the bulb. It is, in fact, the aforementioned cooling fan which is the problem. I wouldn't want a bulb without the fan (there are some with just cooling fins) but I also would not want to run with out the dust cap.
My car admittedly has a somewhat different headlight setup than that of AlanS but in looking at the exploded diagrams for 2006 it appears that he may be faced with a similar problem.
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'79 242, '84 DL 2 door, '80 DL 2 door, '89 DL Wagon, '15 XC70 T6 AWD
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