VPI Classic---Denon 103 won't fit on arm??

I was all ready to order a VPI Classic turntable from Music Direct, but then last night I read a comment on audiokarma that the Denon 103 cartridge cannot be mounted on the JMW 10.5i arm because the pins interfere with the back of the headshell or some such thing---does anyone know anything about this? I'm having a hard time believing this, but I want to be sure. I own a Denon 103R, currently mounted on a Rega P25. I'm going to give Music Direct a call and see what they say, but any info from you guys is appreciated, thanks.