Is anyone here is using end pads, or some other form of leaf spring friction & noise reduction?

I'm eyeing these type of pads that sandwich between the leaf ends:
[img]https://www.dieseltruckresource.com...urethane-spring-tip-inserts-img_5450.jpg[/img]
[img]https://www.dieseltruckresource.com...urethane-spring-tip-inserts-img_5585.jpg[/img]
[img]https://www.dieseltruckresource.com...urethane-spring-tip-inserts-img_5578.jpg[/img]


Holes would need to be drilled through the spring tips in order to use them... but they might be pretty nice.
On the other hand i'm skeptical, since I've never seen an OE spring with such inserts.
I definitely wouldn't want to put anything between the centers of the springs (except maybe steel strips), lest it wear and loosen my u bolts.
Attachments
spring-pad1.jpg (35.2 KB, 147 downloads)
spring-pad2.jpg (46.54 KB, 147 downloads)
spring-pad3.jpg (41.08 KB, 144 downloads)

'59 Chevy Suburban, NAPCO