Locating Expansion Team Assets

I have installed some jersey mods for 2k21, and i think im ready to step it up. I played MyLeague for some time now and have made an expansion team, so with my basic texture modding experience prior to this i have made a jersey using a template i found. So file i got all the tools i needed to make a custom jersey i just have a problem on finding the .iff files corresponding to my expansion team jersey. With that i would also like do the custom arena floors too with it since i also found the template for it somewhere. the only problem is i couldnt find the corresponding jersey and arena floor files for it. Thanks in advance