Here are a few I have that you may try.
You will need the shape files in the attaced Zip file.
*DUCT3,Flex Duct 000000000000000
A,0.0001,-0.02,[FLEX,FlexDuct.shx,s=0.02],-0.02,0.0001
*DUCT4,Flex Duct 000000000000000
A,0.0001,-0.02,[FLEX2,Flex2.shx,s=0.02],-0.02,0.0001
*twist,
A,0,-.055244,[")",STANDARD,y=-.01,s=.165722,r=270],-.113255,[")",STANDARD,y=.01,s=.165722,r=90],-.055247
*CLAM,Running Clam Shape
A,0.0001,-0.05,[CLAM,clam.shx,x=-0.01,s=0.0254],-0.05,[CLAM,clam.shx,r=180,x=-0.01,s=0.0254],-0.05
*BATT,Batting SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS
A,0.00010000,-0.02000000,[Batt,ltypes-cab.shx,r=0.0000,S=0.10000000,X=-0.02000000,Y=0.00000000],-0.04000000,[Batt,ltypes-cab.shx,r=180.0000,S=0.10000000,X=0.02000000,Y=0.00000000],-0.02000000