[Boatanchors] NC-188 re-cap query

[Will]

I am recapping my newly acquired NC-188, as hopefully the remedy to getting
nothing but very loud buzz out of it at the moment. 

There are several caps that resemble dominoes, little red-brown dominoes with
six variously color spots on them, and I don't know how to read their color
code, or what type of cap they are, and thus if I need to replace them only
with a modern equivalent(?) Please tell me if you can how to read and treat
these.

Also, this being the first time I have completely recapped a receiver, should
I replace all the disc ceramics with film/Orange Drop type caps, or just plain
discs?

Thanks.

Will, KD7BFX