looking for header flange for 12v

i have a 1/2 in. s.s. one cut out by zz fab that i won't be using pm me for more info... also have a t4 flange
 
mild or S.S.? I can get ether cut out. I have one in mild at the shop. There lazer cut 1/2" thick also have t3 t6 and if I can find a t4 I can get them cut out to! Let me know!
 
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