Anamorphic means non-square pixels or width/height != aspectratio. However, the numbers you supply are not anamorphic. I did a google search on “premiere HD Anamorphic 1080” and found:
Based on the description
Footage has a 1440x1080 or 960x720 frame size, and the desired result is a 16:9 frame aspect ratio.
This tells us you need to create custom video mode with resolution = 1440 x 1080 and aspect ratio = 16 : 9. If you did that, and it looks wrong, then upload a screenshot that shows the image in the player and also shows the Properties panel.