Side by side.

Specification	SD-12180 SD-12180 Quote
Width	0.744"
Height	2.320"
Flange	0.208"
Material	Rubber
Type	Sponge
Durometer	2A5 (sponge grade)
Colour	Black
Mount	Push On
Bulb position	Top
Core	1.120in Wire

Spec sheets live on each part's page.