Rotring 600 parts

Greetings all- Recently, my old-style (knurled grip) Rotring 600 broke,
the plastic tube that connects to the converter/cartridge, holds the
nib/ink distribution comb (is there a proper name for this thing?) and
retains the knurled grip cracked at the front, causing the grip to no
longer be 'retained'.

I sent the pen to Parker et al. for servicing, and, bless their little
hearts they sent me a replacement pen, alas it is the 'new' style. (I'm
not looking a horse in the mouth here too closely mind you...) Their
claim on the receipt is that the trim-line of my pen is no longer
available

Would there happen to be anyone out there who has some strange
stockpile of old Rotring 600 parts that might have this thing? It would
be a shame to let this otherwise great pen (gold nib too!) go to the
rubbish bin.