Thank you, LaLi. I appreciate you identifying the parts numbers as well places where to purchase them. I ended up ordering all the parts directly from RWO Marine in England, plus I saved in shipping costs since I was able to get all the parts from one source. Sail On!
Btw, here are the part #s (less the line) and costs:
R6057 x 1 shackle £6.43
R4970 x 1 Double V jammer £13.48
R4890 x 1 Vang key angle £4.11
R1080 x Double block £9.88