Side by side.

Specification	Uni-Seal-B Uni-Seal B Quote
Width	1.057"
Height	0.850"
Material	Rubber
Type	Sponge
Durometer	2A4 (sponge grade)
Colour	Black
Mount	Tape
Bulb position	Top
Tape	3M Heat-Activated Tape
Industries	Recreational Vehicles

Spec sheets live on each part's page.