after market 3-point 2mm spacer for rega planar 3

I am using Acoustic Signature on my table but I think I like the ones that  imahifiman suggested.
If interested audioadvice.com sells the type I am using. They may offer more thickness choices from what I see.

I just wish Rega would add VTA capability to their tonearm. But I am sure the lack of it,sells way more cartridges for them. So flashcider, what cartridge are you using?

You might contact Ortofon and see if they will respond. I use a alyra Kleos and Jonathan Carr designer of Lyra told ,e the ideal thickness was 3.4mm so with the Acoustic Signature I have been able to achieve 3.5 which is close enough. 

Another option would be to experiment since they are much easier to add and subtract.