'78 Y88 15x8 snowflakes have the sharp edge on the inner edge of the outer rim & the tops of the "veins" are not machined. All '78 15x8 snowflakes I've ever had (have) were made by mfg by Western Wheel.
The '79-81 15x8 snowflake will not have he sharp edge, but a slightly radiused edge, & the veins are fully machined. Western produced most of these, but there was another vender which cast a version of the later style fully machined wheel, if one has a pieced together set, examine the machined veins towards the caps for difference in casting & examine the back sides for the manufacturer name.
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