Relay for LED indy's

Who online sells the relay to give correct flash-rate? What's the right type?

I just bought a full set of LED indy's and resistors but they get way too hot. The only place I can hide them is behind the headstock with the rest of the connector blocks and I'm not gonna risk my loom melting together.

I know I'll have to keep the old relay in there, before someone else tells me this.

I need one asap as I should have put it in for MOT today but didn't want to risk a costly fail on something trivial.