Steel Rims: 5x4" and 5x4.5" lug pattern with 9" hub cap?

Long story short: I have 13" rims, 9" drums, 5x4" lug pattern. The best options I find for a disk brake conversion push me to 5x4.5" lug pattern. I don't want to replace the rear axle (yet). So, has anyone found steel rims that have both the 5x4" and 5x4.5" lug pattern that will also accept 9" hub caps? So far I've had no luck.