Installed LEDs Flashing Fast?

2016 Chevy Impala Limited Police sedan. Changed the turn signal lightbulbs to LEDS. Using flashers (all the lights), no issues. When I use one turn signal, the lights go wildly fast. I bought some relays (AICEL 2 Pin LED Electronic Flasher Relay, 4 Pack 12V Speed Adjustable Flasher Relays) that purportedly fit the model to a "t". I don't know which relay to swap out with the new one(s). Need to know how many I change our and where they go to slow it down. Is it in the engine circuit panel or the panel at the kick panel on the passenger side, . Don't know which to relay or relays, to pull and replace. IF it's just that. Great! I'd rather replace a relay than rewire it. Need to know if you have an image of the fuse box and which relay(s) I need to swap out to slow the flashers with less power. If it just takes one or more relays, I just need to know exactly where they go and which relay to replace in the fuse box. The fuse box in the engine bay is crazy clean and well marked, but not in a way that makes it clear which relay to pull and swap (if it's in the engine, and not on the passenger side or even somewhere else in the car)! So, if you can show me which relay(s) to change, this could be an easy fix.