Side by side.

Specification	SD-12155 SD-12155 Quote
Width	0.787"
Height	1.296"
Flange	0.200"
Material	Rubber
Type	Sponge
Durometer	2A3 (sponge grade)
Colour	Black
Mount	Push On
Bulb position	Top
Core	1.120in Wire

Spec sheets live on each part's page.