Clearaudio Talisman wont fit my JMW 12.7 arm ....

Hi there ,
I just bought a Clearudio Talisman Gold V2 cartridge to go on my VPI TNT 6 fitted with a JMW 12.7 arm . When the Dealer went to fit the cartridge , the cartridge couldn't be moved far enough back in the headshell as the pins/mounting wires were hard up against the rear of the headshell cutout .The Dealer stated that the headshell component of the 12.7 was fairly short compared to many other tonearms . Just wondering if anyone else has encountered problems with cartridge mounting on the 12.7 and how this was resolved ( if at all ) ?
What sub $2000 cartridges definitely fit from users experience ? Many Thanks .