welcome to the forum
If your referring to the "pig tail", the hose that goes to the regulator from the tank and has that large plastic nut on it, yes they come in different lengths. Only thing to pay attention to is the ends that go to the regulator. there are two styles, NPT and flare.
Best bet is to take one off to match. If its FLARE then NO TAPE OR SEALANT is used. If it's NPT then you must use YELLOW tape or thread sealant.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.