Clear master cylinder reservoir?
They are not all black. Some of them were translucent white (like a windshield washer bottle) from the factory, at least as far back as '78 and at least as recently as '90. There are many different reservoirs for this type of master cylinder -- not just black vs. see-thru, but also different capacity/size and different mount angles; some power boosters mount the master cylinder at a pronounced nose-up angle. Six different reservoirs are listed in the '87 master parts catalogue, for example. Of those, some are listed as "w/fluid window" and some "w/o fluid window", and others don't specify.
Keep walking thru the junkyards long enough and you'll find a translucent reservoir that'll work for you. I agree they all should've been that way.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=140418316514 for one example of what the see-thru ones look like in the original style. I wonder if it'd be possible to swap on a late see-thru reservoir like
this one, but I've never tried it (yet).
