New 'Ender 3 Pro' came with two identical right-side vertical extrusions

I was hoping for some help from someone who owns an Ender 3 Pro. I just received mine yesterday. My problem is that I received two identical 'right side' vertical aluminum extrusions. The right one has the two pre-drilled holes set farther apart for mounting the power supply. The left vertical (which I'm missing) has 2 holes drilled towards the bottom end for mounting the Z-axis motor. I've already contacted the seller and they are shipping me that missing left one, but it's going to take 10 days from China (:mad:). Having two right verticals puts a stop to me putting this printer together since I can't mount the Z-axis motor. However, I'd like to take a whack at drilling the two missing holes I need into one of the two right pieces to convert it into a left one (I doubt they'll ask me to ship one of them back). At least this way I can get it going until they send me the missing part. I have the ability to drill these holes accurately (drill press) and the proper tools to tap the holes (they are M4 with a 0.7 tooth pitch according to my tooth gauge). The distance between the two holes should center up in the two vertical aluminum slots perfectly, however my problem is that I don't know how high or low to mount the motor on the vertical extrusion. Can someone who owns this printer (pro version) please take a measurement and tell me how much of a gap there is between the bottom of the Z-axis motor and the horizontal base? Thanks in advance for any help!

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if it was standard profile extrusion you could just attach the motor with ordinary strut-nuts.
might be worth a shot anyway.

Thanks for the advice, I don't know why I didn't think of that. However I didn't have any strut nuts that would fit this style extrusion. I just ended up using some regular nuts with washers/lock washers. I took a guess on how high the motor was mounted based on some footage of the printer, and got the Z screw so it wasn't too high. I just got done putting it all together and just fired it up about 10 minutes ago. Looking good so far! Thanks again!

good to see a working ender 3 - around here we mainly get people with the standard non-working models ;-)