https://www.amazon.com/dp/B009RGJ47S

This should be the one

Im using 2 of these shakers https://www.amazon.com/gp/product/B009RGJ47S/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1

nice! OR you can just do this:

$17 x 2 Dayton Audio TT25-8 Puck Tactile Transducer Mini Bass Shaker 8 Ohm

https://www.amazon.com/gp/product/B009RGJ47S

$33 - 1 nobsound amp

https://www.amazon.com/gp/product/B06Y67PZB1

- some zip ties to attach to pedals

- speaker wire ($10-12)

- optionally upgraded power adapter