Red opaque 2-3/4 inch overall length (2-1/8 inch hole to hole centers) plastic Lane Guide (also known as light hood, ball guide, rollover guide, lane separator) with single side apron.
Can cut side of PG41 to make PG21.
Actual product may differ from photo regarding details and design.
Reference:
PG21
A-9395
GTB-9395
Select manufacturer to view game compatibility

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USE A-9395

Red opaque 2-1/8 inch overall length measured end to end (or 1-1/2 inch OC)