Flat mount caliper + post mount fork = head scratching

Post-mount caliper. I'm both being flippant and serious. Flat-to-post adapters are always such a bodge and highly dependent on the shape of the fork mount.

yes thats in my mind just trying to make what is in-front of me work 

You might need a replacement caliper or is that obvious

yep its obvious

I had exactly the same issue with flat mount shimano calipers on a post mount bike, and bought that wolf mount. I also couldn’t make it work - it just didn’t fit, so sent it back and ended up with different calipers, which was a pain in the arse but the only way I could solve it

https://www.aliexpress.com/item/1005008194063727.html?spm=a2g0o.productlist.main.11.1c5f2LxM2LxMjR&algo_pvid=fccab143-21d0-4d87-b02e-dbe3dd2ad58b&pdp_ext_f=%7B%22order%22%3A%2273%22%2C%22eval%22%3A%221%22%7D&utparam-url=scene%3Asearch%7Cquery_from%3A

Various options but if your mount is like this one....it doesn't look good.

That's the ****** 

Looking for pm mount SRAM hrd calipers 

sram calipers ordered