personnally i use the asso part
aluminium ballstub washer in this pack 4 two mm + 4 x ONE millimeter washer
asso ref 31286

for low grip you can notice that i use the steering blocks on reverse way like they are now on the tc6.1
i use same washer to keep the steering turnbuckle as flat as possible
washer are under the ballstud on the bellcrank
can sent you pictures if needed

hope this can be helpfull
have a nice day