i have one set left, ill need to make more soon if those sell. the spacers are needed no matter which engine you have, i dont make them, they are $30 on ebay(from s10warehouse i think) or you can use washers to space it out. you shouldnt have to change the axle out for any reason. the early axles have a different flange that ive heard can be modified for the blazer backing plate and bracket, if you have the square flange, everything is bolt on. there should be a thread somehwere of the modifications for the early flange. it should just require drilling 2 holes and cutting the top part off.