I've been looking around for D176 guide bars. It's not that they're really hard to find. They just tend to be expensive and hard to find in a 20" length. Oregons tend to be over $50 and an Oregon with "Echo" painted on it runs close to $80. So I was encouraged when i found a 20"x3/8" bar that looked a lot like a D176 in Tractor Supply. Bar with chain, 70 dl .050, priced at $40. I went home for a pair of calipers and liked what I saw.
The chain is the same chinese brand they sell at home depot, the one with a logo that looks like 3/4 of an Audi. I haven't measured yet, but the top plates look a blond c.h. longer that oregon's. I had to hit the bar slot with a flat file, just a tiny bit, before it would fit past the threads on the bar studs, but i had to do that with an oregon bar too. The TSC scu is 1044209.
The chain is the same chinese brand they sell at home depot, the one with a logo that looks like 3/4 of an Audi. I haven't measured yet, but the top plates look a blond c.h. longer that oregon's. I had to hit the bar slot with a flat file, just a tiny bit, before it would fit past the threads on the bar studs, but i had to do that with an oregon bar too. The TSC scu is 1044209.