At this point there are some questions regarding the SME.
First is whether it has the Dampening Trough and the 3 paddels, this was an option on the series III and can be useful trying various compliance cartridges.
Second be aware that there was a 1st generation arm tube and a later version that varied both in length and head shell size, you need to use the appropriate specs for alignment. Black colour arm tube was the latest geometry.
Thirdly if the original SME cables are in use they were factory supplied with additional capacitance loading internally at the RCA terminals.
Have the shop inspect your AKG they might even know its age if they supplied it.
First is whether it has the Dampening Trough and the 3 paddels, this was an option on the series III and can be useful trying various compliance cartridges.
Second be aware that there was a 1st generation arm tube and a later version that varied both in length and head shell size, you need to use the appropriate specs for alignment. Black colour arm tube was the latest geometry.
Thirdly if the original SME cables are in use they were factory supplied with additional capacitance loading internally at the RCA terminals.
Have the shop inspect your AKG they might even know its age if they supplied it.