I swapped my OEM F32 console trim for the M4 with the knee rest, even went so far as to have the knee rest reupholstered in Alcantara w/M Stitching
Only to find out that my knee doesn't hit it anyway
I'm 5'10 and like to set back with my arm extended when on steering wheel
As stated the knee rest is not available separately, plus the std console that does not have the knee rest is not molded correctly or have the necessary mounting points for one
Best avenue is to get the correct M4 console trim with rest already included either new, or used from forum or scrap yard