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+1 to Earl
of you can try Tom Heller from Missouri.... I don't have his info but you can find him at the www.P38forum.com
I would guess the brown grips are the correct ones but I am not 100%
It should hold 6 rounds +1 in the chamber

 

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If this will be for carry I would stay away from blueing alltogether and get the PPK hardchromed by Ford's or maybe have it NP3'ed.
This, besides making it durable and resistand to holster wear will help keeping it clean.
If you are going to just take it to the range and or keep it in the safe, I would not touch it but just keep it clean so no rust will form where the blueing is gone.

 

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The markings on the left side of your slide are not engraved or roll marked like on older PP or PPK's.

 

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Orlando
they do make brown finger rest extensions for the PPK mags.
I would say that the PPK needs a refinish...... no matter what you are going to use it for.... and if I may give you a idea.
http://www.fordsguns.com/

 

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Why would you finish a carry gun in Nickel ????
I would use something that will hold up to holster wear. Hardchrome, NP3 or even have it Melonite treated....that will give it a nice dark grey finish.. almost black and you don't have to worry about rust anymore.