well if your using your DX tranny...you can reuse your HF axles. the 86-89 teg shaft will not bolt up as you just learned and you wont ever use 89 teg axles. if you had the ZC shaft you would use 90-93 teg axles. in your case now id go out and buy DX or SI knuckle assembly so you can use there hub and have a bigger rotor if you would like and go get some SI axles.
goodluck