Hi Joe,
Indicators usually blink at double-time if it detects that one bulb burned out. Led lights tend to draw far less power than bulbs, and this tricks the relay into thinking it’s trying to drive a burnt out bulb.
Instead of changing the relay, you might get away with adding a couple of resistors, one on each side of the circuit (in series). I’d presume it’s easier on the back lights than on the fronts to be honest.
Stores that sell the led lights also usually sell resistors for this same purpose as well. You might be able to get in touch with them and they might be able to help you with the exact part.
As far as your exact question is concerned, I’m afraid I’m not sure where you would find the relay and if swapping it for another one would help you with this issue at all.
Cheers!