Does all E66 comfort headrest fit on the E53 seats?

I think only if they have electric headrests with the bigger posts. Otherwise you will have to somehow modify the headrest to take your original posts...

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Made lots of progress in reassmbly.
Put on oil cooler bracket with new gasket. Torqued it down.
Popped out passenger side axle. New output seal.
Put on new front flex disc. Torqued down diff.
New inner o-ring and output shaft seal on the diff.
Popped in RH side axle.
Changed RH thrust arm, and control arm.
Not torqued yet.
Went to put oil lines to T-stat. Wrong o-rings. So I put on the tensioner by the water pump, and torqued that.
Then called the dealership for the O-ring.
Just got back from picking those up.
Might attack it again tomorrow, but I'm not looking forward to the alternator at all.

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You have water cooled alternator like M62? I've changed those a couple times it was easier than my M54.

The PS pump had a very tricky screw/nut but with the right tool it was a breeze.

Just replaced the expansion tank coolant hose.
Quick and painless 10 minute job.
I used a little red grease for plastic on the o rings.
Almost every part is new now in the coolant system : Radiator,expansion tank,oil cooler radiator(the aluminium block underneath the radiator)all the hoses,coolant return steel pipe(the one in the valley between the cylinders)
Hooray,my beast is fully functional,apart from the rear door lock actuators,but those are a job for another day.

You going to rebuild them? Follow my DIY and save $215 or so per door.


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Good idea! I can give it a go.
Do you have a link on this site for your DIY method?

Nope. Regular alternator.
PS pump wasn't tricky to remove. I'm hoping remounting is the same.

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With all the work you've done, the alternator should be a breeze. Just remember to clearance the bolt guides/pins before putting it back in. Otherwise you'll be fighting to get it in.