G'day Phil, I'm certain it just had 2 rails bolted over the bulkhead behind the seats and on the rear of the tub (wide C shape section), maybe if you posted in AULRO.com down in the section under REMLR you may get a definitive answer, I have a fully restored Series 2A 109" 'Bloodbox' but I suppose that's not what you are chasing anyway cheers Dennis
PS where abouts are you located?? I'm in Oz