Side by side.

Specification	SD-12130 SD-12130 Quote
Width	1.260"
Height	1.260"
Flange	0.150"
Material	Rubber
Type	Sponge
Durometer	2A3 (sponge grade)
Colour	Black
Mount	Push On
Bulb position	Side
Core	1in Center Web Steel
Industries	Utility Vehicles

Spec sheets live on each part's page.