yep Keisler has a shaker on their 6.1 as well as my '71 Cuda with 6.1 Hemi.
But an AAr quality fiberglass bubble, AMD hood and a Year One repo fiberglass outer adapter ring. attach the outer adapter ring to the fuel rail mounting bolts with some minor fabbing and bolt on on the bubble to t he adapter just as you would on a stock shaker. Not all that difficult and it fits.