I found a reference somewhere that the red and blue indicated short and long but I don't recall which was which. That same site just said to ignore the other pattern of paint so I have no idea what that might be.

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Scott - K3PSO
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1984 300D turbo ~203k miles
2008 FourWinds Hurricane 31' RV

Past
'85 300D turbo ~280k miles
'83 300D turbo ~300k miles
'05 Mini Cooper convertible
'96 BMW R1100-RT
'71 Honda CB175 - multi-winter project
'82 Honda CB450 NightHawk
'85 300D turbo ~328k miles
'75 BMW 2002
'66 Beetle