Chromatic parts

Hello again Kinya,

Now that thanks to your advice I've got my Super 64 working well my chromatic interest has been resparked.  I have a vintage-ish Hohner 64 Chromonica, old enough that it has the fake alligator plastic case and woodgrained plastic comb. It's a harp that has some sentimental value to me, as well as a milder tone that I sometime prefer to my Super 64.  My issue with it is that the plating on the mouthpiece has worn away and my skin seems to be a little sensitivity to the brass beneath which makes playing it a problem.  Can I either buy a replacement mouthpiece and perhaps slide assembly for this harp anywhere, or do you know of anyone who is replating parts like these?

Thank you