Side by side.

Specification	ED-5360-Nitrile ED-5360-Nitrile Quote
Width	0.520"
Height	2.500"
Flange	0.125"
Material	Nitrile
Durometer	2A4 (sponge grade)
Colour	Black
Mount	Push On
Core	SD-381 L Spring Steel

Spec sheets live on each part's page.