What about just finding a TJ getting parted out and cutting out the coil parts? It doesnt seem like you would need to buy a kit if you know how to weld. I have seen TJ frames go for cheap on CL. Any reason that wouldnt work? I figure you could just cut them off the frame and weld the parts onto the YJ frame. Although I have no plans to do a coil over, I have wondered why people dont do that.
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95 YJ, 2.5 AX15 conversion, 4.0 TB, SOA +1.5", 33" DC Crusher Tires, 8.8 Rear w/welded tubes + LSD, Spartan Locker HP30 Front w/solid axle swap, Rocky Road OTT kit, Safari Snorkel, Warn VR8000 Winch, Smittybuilt front Bumper, JKS Disconnects, AA SYE, Teraflex Shock Bar in Rear, 1/2" Boomerang Shackles, RE Add a Leafs, Homebrew Traction Bar, Monstalined in&out, LED Tail lights, 1700 Watt Stereo