First off it Brut not Brute, second the first year they made Bruts were 72 and then they only made a 440 triple and third the 295 were twins not triples. 73 was the the first year for the LC29 (295cc 2 cly). Got a picture of your sled? What do you mean by hood cutout insert? I have a 73 LC44. I know of a few guys you can get parts from but be prepared to pay for them. Brut part are extremely rare!
If its a triple its got to be a 440. They are a very rare sled, no matter if its a 295, 340 or the 440 triple. I will go through my email and pm you a couple guys to get in touch with about info on them and parts.
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