Welcome to the forum. Although you can post in any forum, the USA forum is here in case of local regs or laws
Are you sure? The one you linked to is 9mm shorter in total.
Reply to the thread, titled "Where can I buy this (long) click clack mechanism?" which is posted in Bathroom Advice on Plumbers Forums.
We recommend City Plumbing Supplies, BES, and Plumbing Superstore for all plumbing supplies.