SD crossmember size

Does anybody know what size square tube Suicide Doors uses for their S-10 gas tank crossmembers? It looks like 1x2 but my steel place can only get that in 1/8th inch wall and that doesn

im pretty sure its 1/8th wall.

im pretty sure its 1/8th wall.

ur sure its not 2x3? And i think it is only 1/8in, maybe 3/16in, but def not 1/4in like everything else they sell!!!

its not 2x3 or 1x3. the best i can tell its 1.5x3. and im almost positive its 3/16 wall. but ive made them out of 2x3x.125, worked just fine