WTB/WTT SR9 10 rd baseplates

I'm looking for the SR9 magazine baseplate that makes the 10 round SR9c magazine compatible with the full size SR series. Just looking for the baseplate, not the whole magazine which I cannot find online. I've got plenty of the 10 round mags for the SR9c, so I'm only interested in the baseplate.

I can't post pictures but the baseplate looks like the one pictured in the link below.
https://www.budsgunshop.com/product_info.php/products_id/52389