Where can I get carb stacks like these?

[98 SNAKE EATER]

I've been thinking about adding a dual Hilborn scoop to my '29 Ford, but because it has a recessed firewall, I need a pair of tall stacks to clear the cowl





The only stacks I've found are 1-1.5" tall and need to be stacked (I'd much rather get one piece stacks)




Rick