Same here... Last summer I looked with very bright LED flashlight and couldn't see markings on any of the isolators. I thought for sure I was included in the SB because my 12 is sn 58. Van's sent new isolators right away and I supported engine and loosened the two top mounts only to discover markings hidden by engine mount rings.
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Jim Stricker
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 618 
LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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