Thanks nulu! That worked but with some additional steps.
On first try the heat and grease didn't work so I removed the air filter housing cover to give that end of the tube more space. Then with a Dremel I beveled the leading edge of the ridge inside the tube, cleaned it, heated it, lubed it, and was able to wiggle it into place.
Thanks again.

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W204 13 C250
W220 03 S500 4Matic Designo
W163 02 ML500
W208 01 CLK430
E39 99 520i
W202 95 C280 (Sold)
W210 96 E320 (Sold)
W124 88 300TE (Sold)
W202 99 C280 (Totaled)