Anyone know where to get a 1" wood/phenolic spacer for the 850 ThermoQuad?

Hi there fella's, all the ones I see online for a spreadbore 4bbl are for the smaller primary TQ's or Quadrajets.. None seem to have the 1.5" primary holes for the 850's.

I'd be looking for a 4 hole one if possible, but I suppose a wide open one would be ok too.

I've heard there is more signal to the carb with the the 4 hole ones. True or not?