Good morn,
That looks like a nice car - similar i many ways to the Royal Barge (1980 model).
I have not found any parts not available via the internet (mostly eBay and Amazon) so far.
With a project like this it is (in my opinion) important to understand one's aim at the outset. If your intention is to maximise the value of the car then that would be very different from a rolling restoration to drive yourself. With the RB I've made no pretence at a restoration and quite like the 40 years worth of history it wears.
Good fortune,
Alan
PS. There is a short piece about fixing the RB's headlamp wipers here:
https://www.volvoforums.org.uk/showp...&postcount=519
PPS. These are the same as the headlamp wiper blades I bought a year ago (the price has increased by a pound or two):
http://https://www.ebay.co.uk/itm/Ge....m46890.l49292
PPPS. This piece about the headlamp washers from the RB thread may also be useful:
https://www.volvoforums.org.uk/showp...&postcount=456