I don't know 100% - I never tried it, but the numbers for the lightning pulleys and the mustang are the same in the SVT catalog for all 87-96 5.0 5.8 trucks, and 87-93 mustang. see p79 2000 SVT catalog.
Depending on your stereo, fog lights, etc. you may or may not have enough alternator left over with the pulleys. On my 90 LX 5.0, it would flicker the lights at idle if the wipers were on (rain / night) and in 108 degree August here if I got stuck in stop and go on 635 (worst hwy in Dallas) she'd get a little hot at idle with the AC on. Not overheated, just enough to worry me into holding the idle with my foot to about 1200. You've got a *lot* more radiator in your L than in your 'stang, so that is not as big a worry. In return, a little gas mileage, and about 5-10 hp. recovered.
If you're not in a high traffic area, you probably will never see the things I was fussing about, but I'd try it just because it's pretty much free and probably a couple hours labor at the most to swap in and back if you hate them..