Well, I had to modify (weld) one from a 5.0, well, a friend of a friend did it for me.
Holcomb Motorsports and FRPP sells them for about $50 - $60, but they are the adjustable ones that need to be welded (an easy job for whoever does that sort of thing).
I'd go with one of those.
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'79 Mustang Coup w/ 4" Cowl
Stock 5.8L, C4 w/ shift kit
Holley 750 cfm, Edelbrock Performer RPM intake
1 5/8" MAC shorty headers, Al driveshaft
2.5" Off road H-pipe, 2-chamber Flowmasters
Front: 225/60/15, Rear: 255/60/15 Eagle GT II
Weld wheels (15x6;15x8), 8.8" Rear w/ 3.55s
14 x 4” K&N air filter (getting the Xtreme setup someday)
"Red, thou art my companion. Hasten now your quickened metamorphosis to
Green that I may conquer all who dare abide there beside me. May they be left
thither behind burnt black." ---Fox Body