Side by side.

Specification	SD-217-AT SD-217-AT Quote
Width	0.662"
Height	0.562"
Material	Rubber
Type	Sponge
Durometer	2A2 (sponge grade)
Colour	Black
Mount	Tape
Bulb position	Top
Tape	3M Heat-Activated Tape
Industries	Transportation

Spec sheets live on each part's page.