Tach Cluster Question - Need Part Number Information

[Evil Trailblazer SS]

So, the tach cluster I bought as a few broken tabs and all that...plus it was a pre-84 unit that was modified at the speedo so the speed buffer was able to be connected. Through my research, I found that this cluster case's part number is 25017375. I found a brand new one at a dealer. I will purchase this one if I am forced to, but I do not "want" to modify a cluster case to work. I'd rather try to find the right case.

I found another part number for a supposed similar case (25044310) but I cannot find any info other than what my GM parts guru buddy said. He said this part number is called out for the same vehicles and same model years as the 25017375 case (1979-1984).

Since the speed buffer speedo (electronic cruise control) was offered starting in late 1983 production AND tachs were offered up until 1986, I would like to find the correct instrument cluster case for my truck (1987 V30 WITH Cruise/has speed buffer) if it were built with a tach from the factory.

Can anyone help?
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