Side by side.

Specification	ED-5381 ED-5381 Quote
Width	2.500"
Height	0.650"
Flange	0.125"
Material	Rubber
Type	Sponge
Durometer	2A2 (sponge grade)
Colour	Black
Mount	Push On
Core	SD-487 Spring Steel
Industries	Emergency Vehicles and Heavy Trucks

Spec sheets live on each part's page.