My car is in the service center now getting the jump seats and I should get it back tomorrow. I asked what the VIN cutoff was and the worker said "6000" - I asked about the 5400 number that was on the forum and he hadn't heard that, he just repeated 6000. He also said that it is technically possible to add the extra crash support for VINs after the cutoff, but that would cost about $6000 extra. On my estimate it says "crossmember installation not required". Will post pics when I get it back.
hmm interesting as I'm 5837! I wonder if I can get it... but I wouldn't want the cheap cloth looking one! Is the one your getting the all-cloth version?