Side by side.

Specification	ED-50470 ED-50470 Quote
Width	2.000"
Height	2.150"
Flange	0.125"
Material	Rubber
Type	Sponge
Durometer	2A3 (sponge grade)
Colour	Black
Mount	Push On
Bulb position	Side
Core	SD-487 Spring Steel
Industries	Recreational Vehicles

Spec sheets live on each part's page.