G'day imadude [Yeah? Prove it .....]. Welcome to GPS Power.
Can't answer the question of availability of that specific version of Gen5, but your other problem of the stuck disc maybe can be solved without disassembling the head unit. This works for most AU Denso-type units to force eject: Press upper right corner of screen then lower right corner separately in succession. Good luck, let's know if it works and if you track down the right disc.