Side by side.

Specification	ED-50480 ED-50480 Quote
Width	1.900"
Height	3.700"
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	Emergency Vehicles

Spec sheets live on each part's page.