Side by side.

Specification	SD-12614 SD-12614 Quote
Width	1.340"
Height	0.650"
Flange	0.512"
Material	Rubber
Type	Sponge
Durometer	2A3 (sponge grade)
Colour	Black
Mount	Push On
Bulb position	Side
Core	1.7in Wire

Spec sheets live on each part's page.