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The only GL model sold in North America in the '83 model year were the GL650 and GL650I (Interstate), neither of which came with a silver engine. The 400 and 500 engines are silver but the 400s weren't imported to North America and the last year for the 500 was '82.

One theory about those lugs on the engine is that they intended to produce a variation on the engine for use in a generator; The general consensus is that they must have been there to fasten the block to something during machining or assembly. But those of us with sidecars know that they are really there for attaching a subframe to provide the lower front mounting point for the sidecar ;-)

Many people have used those lugs to attach supports for highway pegs but it is very easy to break them off (& sometimes crack the block) if the bike falls over.

BTW: Welcome to the forum. Please add your location to your profile and your bike's model and model year (NOT year first registered) to your signature so that you don't have to remember to tell us every time and we don't have to keep asking when you forget (see Forum Settings link in my signature).

And welcome to the world of antique vehicle ownership (they own us, not the other way around). Your bike is about 4 decades old and the Previous Owners may or may not have done the maintenance necessary to keep it safe & reliable so it is highly recommended to download the Factory Shop Manual for your model (available through the CX Wiki - link in my signature) and go through all of the service procedures, regardless of whether your bike has reached the specified mileage.
I also recommend looking on all rubber parts with suspicion because rubber does not age gracefully. Check the date codes on your tires and replace them if they are over 5 years old no matter how good they look & feel because old rubber simply cannot flow around the irregularities in the asphalt well enough to grip, especially if it is cool or wet. If your bike still has the original rubber brake line(s) (should be replaced every 2 or 3 fluid changes = 5 or 6 years) I recommend shopping for modern stainless braided ones (they last practically forever and double the life of the fluid).
 
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