E36 rear spring pads. Going from 15mm to 5mm top pads.

[yensed]

I've had an awful creeping/squeaking sound coming from my left rear spring for a couple months. I could tell the bottom pad was completely worn so I ordered replacement top and bottom pads for the springs. Now that I have one of the springs out; I see my replacement top pads are 1/3 the thickness of my old ones. A little searching has taught me that E36's had 15mm,10mm and 5mm top pads. Besides the rear sitting 10mm lower if I use the thinner pads - can I expect any negative results from using the thinner replacements? Do convertibles with the sport suspension require that extra thickness as reinforcement? Should I just cut out the middle of the new 5mm ones and stack them over the old ones?

Thanks for the advice.

[scooper]

It depends if there is enough tension for the spring not to fall out at full droop. I think one of the cars I've bought previous had double stacked spring pads with the middle cut out. I thought it was a ghetto fix so I bought the proper pads. Do it once, do it right. Are you going to thicker pads? Because your title seems contrary to what you are asking.