For the anti kickback assembly at the front of the saw, it might be worth investigating if the equivalent part from the current dewalt 300mm saw will fit.
They are a very simple thing, a length of square U section channel with a slot for the clamping bolt and a set of anti kickback fingers on the end. Parts Q D L below.
I vaguely recall these being attached via a pivot bolt in case you want to rip a bevel cut.
My guess is that they won't have redesigned the assembly much if at all over the years so the current version may fit.
View attachment 162011
This snip from an old manual roughly shows the parts.
The riving knife is much more complex. If you have the assembly B and H that allows the riving knife to be rotated up into the blade guard then someone with the same model saw could take theirs out and draw around it for you. You could then file one up out of the correct thickness steel plate.
If you are missing the entire assembly then best bet is to look for a cheap / dead donor saw. RASs are not so favoured these days. I gave my near mint 1501 away because I was fed up with it and they were fetching very little 2nd hand.