Of course they don't fit:
https://www.realoem.com/bmw/enUS/sho...74#18307560780,
https://www.realoem.com/bmw/enUS/sho...78#18307560815.
Regarding ideas, you should have the M135i engine in it first.
By the way, I presume you mean M135i because
135i is quite
different. I believe I saw non-M135i F20 with M135i exhaust though so if you wish to look cheap just dig deeper, perhaps.