It very well could have been a B7100. In the late 70's, B7001 was stamped on the housing. I have a 78/79 B7100 with over 3300 hours, aftermarket ROP'S and no seat belt (they did not come with them).
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I believe that company was AI2, it is/was listed on the Home page for this site. I have found very few (none I could justify) sources for a rock bucket for the BX. What I did find were are all too heavy for the BX.
Here is one ...