SVO, Mike Forte, MAC, LPW, TA and others sell the nice aluminum rear end covers from about $125 up to about $200. They provide some cap stability and some actually incorporate axle stiffeners to help with rear end flex. Check with the forum vendors or your latest Mustang magazine for them.
The Trick-Flow has an aluminum diff cover - cast aluminum construction and extreme duty bearing cap support studs for uncompromised differential protection. The cover and studs come with jam nuts, ARP stainless steel bolts, a 3/8 in. drain plug, and a gasket. Several builders have them and they look nice.
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