Need help! Estate sale German Helmet find w/ liner but is it real??

I found this German helmet today at an estate sale. Im looking for opinions on if it’s real or fake helmet as well as the liner and if they do go together? Thoughts?
The sale did not advertise any militaria so it was a surprise. Also at this estate sale and In relation to this time period I found a large shell in the basement and a bunch of letters to a Cpl. Harry Patterson Btry A 313th from mother, father and girlfriend mailed in 1944.
Any help at all would be ever so appreciated. I’m not an expert in militaria but I always buy it when I see something interesting and cheap because I appreciate the historical significance and enjoy displaying in my house.
-Nicole
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