The challenge is that many, MANY things in Taiwanese boats were hand made to fit, and the chances of finding an exact replacement are pretty slim. I know that I now no longer assume that anything on my boat (also of Taiwanese beginnings) was made by someone who was familiar with either a ruler or a square. The salvage yard option will work for some stuff, but I fear that you will still need to have someone skilled come and make adjustments to either the part or the boat to make sure that it fits properly. It could well be that getting something used and having to make it fit will cost more that just having a new piece made.
I still think that having a tradesman provide an estimate for outright fabrication is worthwhile. If nothing else it will be another set of data for debate in the proceeding. I personally feel that depreciation is not warranted for all items; a wheel pretty much has the same life expectancy as the boat, same goes for the table, etc. For an auto insurance claim, they don't depreciate the cost of a new fender
so why would they in this case?
Speaking of which, if you've got insurance this may be covered as theft -- in which case a surveyor may or may not need to have a look see.
Sourcing replacements for the hardware is gonna take some time on the internet. You probably won't be able to find exact replacements, but should be able to come fairly close. Don't forget to add nuts, bolts, etc, where needed.
For an earlier thread that has contact info for many marine consignment shops, go here