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Hello, could someone direct me to the correct chain? I've attached a pic of the 12" 3005 000 3905 bar but I'm confused by the "RH" after the bar number. Thanks.

Back in the day, I recall RH meaning roller head - i.e. having a roller at the tip of the bar instead of just the chain track. Shouldn't think it makes any difference to the chain length.

You need a 44 link, .043 gauge, 3/8 low profile chain.
Stihl calls it Picco micro.

Here it is in Oregon brand.