quick question about rear rotors

hi im a 5.0 guy and i bought a "rear svo disc conversion" off of some company and i got a 4 lug setup....anyways i just went to upgrade to crossed drilled rotors and they sent me 5 lug and sayed that 86 svo rear discs are only 5 lug

can someone tell me if i got screwed???is there a 4 lug setup???

thanks in advance

thanks a lot... i def. got boned