I feel like I have seen this in a thread before, but no amount of searching has yielded the answer. I am doing a transmission swap and have the manual transmission installed in my car and am getting ready to put in the driveshaft. I bought an entire manual setup from another forum member including the correct driveshaft for a five cylinder car. The only problem is the driveshaft halves were not marked for alignment when they were removed from the donor vehicle. I feel like I have heard there is a factory mark and indeed one half has two "fingers" molded in a and the other half has a single "finger" that seem like they could point to one another in some sort of perfect world of driveshaft balance. The boot that covers the splines at the center support bearing is also torn in two with half remaining on each shaft and trying to align the tears in the boot also seems to point to the fact that the "fingers" may be some sort of factory indication for correct driveshaft alignment. Please see the pictures below and let me know what you think. I am trying to avoid any annoying vibrations at all costs.
Thanks,

Shane

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1985 Euro 300TD Turbo