Help replacing Acorn sliding door rollers

Slide open your door and check inside the door frame for a label with the Series number; if you can get us the Acorn series number we can narrow down the replacement for you. Without knowing the Series you may have one of the following replacement Acorn rollers: SWISCO product code 81-005, 81-027, 81-033, or 81-030.

In that case, the only way to know is to remove the original roller from the door and compare it to the four that Paul listed.