Side by side.

Specification	TS-187 TS-187 Quote
Width	1.330"
Height	0.660"
Material	Rubber
Type	Sponge
Durometer	2A2 (sponge grade)
Colour	Black
Mount	Tape
Bulb position	Top
Tape	3M Heat-Activated Tape

Spec sheets live on each part's page.