Just took a quick look at mine - the housing I used was slightly too large also, so I cut it down and also enlarged the opening in a few discrete places. The surgery is covered by the trim ring, so no big deal. However, I did use a plastic housing so it was easier to cut down to size than your metal one:
an example of the housing style I used: http://www.waxoyl-usa.com/ProductDesc.aspx?code=WIPAC
or http://www.7ent.com/products/headlam...tic-s5400.html
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