Well, guys,

The answer is the Apogee AT-98 tubing. While slightly thicker-walled. the outside diameter is a perfect match. Unfortuantely, the tubing is only available in 18" lengths. The MDRM nose cone fits well and, after sanding the seam slightly, is more or less ready to go.

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NAR 79743
NARTrek Silver
I miss being SAM 062

Awaiting First Launch: Too numerous to count
Finishing: Zooch Saturn V; Alway/Nau BioArcas; Estes Expedition; TLP Standard
Repair/Rescue: Cherokee-D (2); Centuri Nike-Smoke; MX-774
On the Bench: 2650;
Dream Stage: 1/39.37 R-7