RE: Installing H4 Rectangular Headlights
I'll second Daryl's recommendation on having two full sets of the
mounts/adjusters on hand when you go to install the headlights.  I found it
near impossible to get the old mounts/adjusters out without breaking them.
And the new one can be a little difficult to get back in also.  I even
managed to break a mount on one of the high beams in the process.  Luckily I
had purchased two complete sets including the high beams.
And boy, are the H4's an improvement, even without the relay kit installed
or going to higher wattage bulbs.
BTW, I found very good information on the Web about how to figure out the
right pattern to do you own alignment.  If anyone needs that info I think I
have it bookmarked.  All you need is a tape measure, some masking tape, and
a flat wall at about 30 feet.  Oh yeah, a good screwdriver helps....