84 z28

I bought a new set of axles from superior 2 months ago. I have finally got them last week becuase summit have them on backorder forever.I bought the evolution series PN#EV10-4. The picture and description on summit and on superiors site says that there suppsoe to be drilled for 7/16 press in and 1/2in screw in studs. When i opened my box the axles were only 7/16 press in. I called summit and they agreed that there suppose to be a 10 lug pattern.They checked there stock and said that all they had was a 5 lug pattern for the EV10-4. SO then I call superior to make sure there not giving me BS. They say there suppose to be dual pattern but they dont know why i got single so they will look into it. I got a call back later that day and he said that because they were on backorder so long the didnt bother with drilling the 1/2 pattern and sent them all out. Nice way to cut corners and screw the customer. Now im wondering if I should keep these or send them back and by new ones down the road.