'Highpower' -  Welcome to the KCA Forum. You have a very nice looking model 1898 carbine that you are rehabilitating. Your metal finish looks correct to me.
(Your stock even appears in the realm of normal armory refurbishment).

Examine your front-sight blade. Is there a small "C" visible on the Right-Side?
(This could add to the body of evidence that you lucked into a real model 1898 carbine).

You seem knowledgeable and are doing your 'Homework'. Be patient, save the money, and hold-out for a real model 1896 carbine-sight.

IMHO - The model 1898 carbine with the 'short forearm' stock is the most desirable and historic version. The 1898 carbines with the 1899 style stock and other updates are just model 1899 carbines to me.

FWIW - 'Movieman630' (Grandpa's Gun Parts) has the three-section rod and oiler, as a Set, for $50.

An original carbine front-sight hood/protector is a nice accessory to look for at gun shows. A nice one for $100 is a bargain.

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