1900 luger grips

[idler]

Just delivered from G B all matching in fine shape 1900 A E with Germany stamp. $1200.00 I think a good deal.
It came with a pair of aluminum ideal grips, I have seen many ideal grips on the internet but no aluminum ones!
it has an aluminum based magazine, nickel with a k and + but no nos.
where would I find a correct 1900 mag?

Thank you

idler