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I personally just used 15amp fuses on my cars..

With the '96 and '89 i just went from the battery terminal, to a fuse to the relay.. Since the relays are right there next to the battery
on the '91 went from the Battery to a AGU fuse (50 amp?) to another fuse block that then went to the relays..
You did see that setup up right?? I remember taking my '91 to your place once for some reason??

Also i would surgest going to the wrecker, unless you have a pair, of 9006 and 9005 bulbs that are no good.. But trying to explain `They were already broken' to them may not work to well Least then you can make it a `plug and play' setup.. (IE break glass, free the two wires from everything that has to deal with the Light part.. solider on some 20ga wire to the two leads per `bulb'.. Shrink wrap/seal the bulb base.. Run those two leads to the 85 (negative) and 86 (positive) of the relays... ) NOW the down side.. I have YET to find a replacement plug for the 880, 893 and 8?? Bulbs (if you find them, PLEASE let me know if not buy a pair for me ) So it won't be as easy.. but not hard.. I just hacked both Tan Leads for the Fog lights.. and soldered on some 14ga wire to the bulb end that then went to the relay, and like a 20 gauge to the harness end that then controled the relay...
Also if you can find some Dual 87 relays.. i would DIFFERENTLY suggest going that route..

Terminal 30 on a relay is Common
Terminal 87A is Closed
Terminal 87 is Open

There are relays out there that have two 87 terminals (SPST?) So one terminal can go to the right headlight, the other to the left.. to me, it just makes for a semi cleaner, more professional, Way of doing it when you have to power two items under one relay..

50amps good for 720 watts of power.. and being that both low beams and Highbeams are under 10amps each (for Pair of Filaments IE both lows) 50 amp should more or less be over kill..
and are you gonna be trying to wire it so the lows stay on when the highs are on?? (SPDT comes in handy there, depending how you want to hook it up)

The BEST route would be to fuse each Filament separately (IE 6 fuses all together) kinda like BMW and a few other cars least if you have a short on one side, you can still have light coming from the other side instead of, well no light..

4 Relays total would be needed, You can either get Pigtails or my perfered method the Plug housing and Terminals (i know a few electronic stores have them, both ways)

I wish i knew how to Mspaint well enough to draw up something..

YES you can do it basiclly how i have had it in my '91 (even thou i just used a single fuse for each pair of filament) HECK if you can find one of them there Relay holding devices... Imagine how clean it would look.. Also KMS tools (Car parts section?) had 6 gang Hella fuse blocks awhile ago (a decent size box of them) ???

and i woudl use a switching Relay for turning on the lows with highs,
Headlight switch to 87a
Power source (low beam?) to 87
and send 30 to the low beam relays 86
85 would go to ground
86 to high beam (Before or after the relay)

OR you can forget that way.. and just 30 to power, and 87 to Low beam relays 86 (Easier)

Brain Fart...
I'm not seeing things i thought i seen

either way.. I would use the one relay that is surpose to turn on the low beams with the high beams to turn on the low beam relay... instead of havign it power the low beams itself.. But that's just me..

Also you can use a Diode to do the same job.. since you are using relays to power the Headlights.. a simple 1Amp diode would be more then enough to turn on the low beam relay...