Cheaper Amazon one: Bertello Pizza Peel https://www.amazon.com/dp/B07XTP8V77/ref=cm_sw_r_cp_apa_i_GjSkFbXXBY9DK
Bit more expensive one on Amazon, but are the GI Metal ones better for some reason?
Perforated Pizza Peel, G.a HOMEFAVOR 12 x 14 Inch Rectangular Pizza Turning Peel, Professional Anodized Aluminum Turning Pizza Paddle, 26 inch overall https://www.amazon.com/dp/B087JC9BD5/ref=cm_sw_r_cp_apa_i_KkSkFb6EMJ3C0
I have the same setup and this 12” x 14” peel (on Amazon) works perfect for me. Only a 1/2” variance doesn’t sound ideal, especially when you’ll likely want to rotate and reposition the pie as it cooks.