You may want to check out http://www.nitemareperformance.150m.com/spring.html
The perches for their springs are for a 68-72 body, but maybe they can make up a perch for a 66 body. Other than that the stock moog replacement spring is it. Dick Miller makes a clamp that will allow you to use his springs in a 66 I think. However if his springs are anything like the moroso rear springs I wouldn't bother with them.
The perches for their springs are for a 68-72 body, but maybe they can make up a perch for a 66 body. Other than that the stock moog replacement spring is it. Dick Miller makes a clamp that will allow you to use his springs in a 66 I think. However if his springs are anything like the moroso rear springs I wouldn't bother with them.