Heardcuh let me know if you don't get a response from Ross @ Coyote, I'm a master distributor for their products and can get in touch with them. I'm sure they will replace the spacer.
If the wheels do have smaller lug holes you could run a hub-centric spacer for 2014-older Mustang, it will have 1/2-20 studs that will fit through the lug holes.
I've never seen a 14x1.5 spline in red only chrome or black. I have standard bulge acorn in red.
https://www.lugnutguys.com/product/14-15-bulge-acorn-red-5308spr
The OE lugs have a larger contact area to the wheel so the higher torque is dispersed over a wider area. Aftermarket lugs and wheels have a more industry standard smaller seating area and the higher torque specs could cause damage to the seating surface of the lugs and wheels. Exaggerated...
28 years in the retail, wholesale and manufacturing wheel business here. Stick with factory spec when using factory wheels and 85-90 ft/lbs on aftermarket wheels(don't go over (100)
Factory spec for the factory lugs and wheels only. Aftermarket wheels and lugs have a much smaller seating area so a lower torque is used, 85-95 is good for the 14x1.5 thread.
Looks like they're just a China importer. Lug nut items look similar to many brands available here in the U.S.
http://directautoimport.com/catalogues.php
It looks like the clear coat got scratched or was applied badly, moisture got under it and caused the aluminum to oxidize. It will creep and get worse over time if not repaired.
The factory lugs are steel with a cosmetic stainless steel sleeve over the top, they do this so the lugs won't rust. Installing/removing with an impact wrench will wreak havoc on the thin covers. I sell lug nuts for a living and refuse to even carry that type.
The 150 ft lbs is used on the OE wheels only, that lug nut nut has a larger contact area to the wheel so it can take more torque. On aftermarket wheels and lugs the contact area is smaller so 85-95 ft lbs is recommended.