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The locking ring has two tabs that face the lamp and this LED model fixture has screw mountings that collide with the tabs. You have to file off maybe 3mm of the tabs where they collide to get the assembly to lock in correctly.
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Also, the rubber boot that covers the lamp has to be extended to cover the heat sink or forced inward. I went with extending it.
I also ordered the Astra Depot High Power 30W Xenon White H4 9003 HB2 XM-L2 CREE LED Hi/Lo to replace the H4. The low beam seemed a bit too low without adjusting, but I like the combination with the high beam, so I think I'll leave it. I like it.
Brian
1) I decided to only saw off and file down one of the tabs on the nylon lock ring. That did enough to avoid the annoying screws on the removable H4 base plate.
2) I don't think you want that boot to cover the heat-sink. With a bit of hustling I got the boot to slide over the larger diameter heat-tube, and fit between base-plate and heat-sink.
Others,
It was too much fumbling to get it sorted out with the headlight in place.
Decided to remove it for more work space, and put back once assembled. Highly recommended.
You need a 3mm and 4mm hex bit to remove the headlight assembly. Why were they not all 4mm? Oh well.
I replaced the running light with LED also. It needed an intense tug to get the rubber out of the hole.
I got a bag full (50?) general purpose LED's for $10 for that.
Tail/number plate needed more dis-assembly than I expected. Just 4 deep Philips screws. no big deal.
Headlight beam Adjustment screws seems awkward to get at.
Nothing is made for easy maintenance is it now?
Hein