I have a bunch of alignment shims. I had the 1mm made in mild steel to allow finer alignment adjustment. The 2, 3, and 4 mm shims are replated in yellow zinc.
Two for $20, Four for $35, Six for $50, Eight for $65 shipped
I suggest a assortment of two 4mm, four 2mm and two 1mm. That should be more than enough for most cars. If you need more your trailing arm bushings are probably shot.Click to view attachment