Rddragon

Ive posted before about my suspension problems. On my passenger side where the spring goes in up top with the rubber block is worn out, like where the rubber meets the car is wallored or round. Is it ok if i order new rubber pieces and just cut off the round part of the old rubbers and stick it in there as a shim? I need to get a phb and lcas. I was thinking umi since they have a sale on. Heres the question tho Will single adj be ok, or do I need something else? And will it put to much power 'down' for my stock rear diff? Im driving my car for three more months and then it is getting put away till spring when i do full suspension, springs shocks k member sfc rear diff, strut tower brace and getting lowered. I got about 430 hp and 420 ft lbs and aftermarket/wider rims. Thanks Ethan