Will a 1978 left side cover fit on a 1979 Honda Goldwing?

Yes, the 2 years of side covers are inter-changeable.

Honda part #s are split into 3 groups of numbers.

The first 5 numbers tell what the part is - oil filter, seat, side cover, piston, etc.

The middle 3 numbers tell what model bike the part is used on.

Both years have 431 as the middle part number.

The last group denotes manufacturer (denso, bosch, delco), updates (as in recall & quality improvement) and color code.

Here is a site that deals with Goldwing restorations.

http://www.randakks.com/

I'm am Not 100% sure,But I think Yes. Because those 2 Years the Body Styles are Very Simlar. I'm going to txt My Buddy Who is a Motor Cycle Head. His been riding 2 wheel dirt Bikes since He was 3 years old and then Street bikes since Then. He now has a 82 or 83 Nite Hawk. Its the Year all Honda Nite Hawks came Out Blue,White and Black. Let Me get right back with a definit answer as soon as I txt Him Bud.

as long as they are the same type, I'm not sure when the they changed from 4 to 6 cylinders, but all of the 4 cylinder covers should fit. There may be minor details but all the important stuff, bolt patterns, etc should be the same. This falls into the reinventing the wheel area.

It should, the '75-'78 models were more or less identical, the '78-'79, and then in '80 the 1100 came out.

no you are able to't use the valve conceal gasket from a1988 accord on a 1995. thoroughly diverse engines. you will might desire to purchase a sparkling valve conceal gasket with tube seals. the tube seals is why you have oil interior the spark plug tubes.

No i don't think so.