Thanks for the recommendation for replacement. I pulled the stock selenoid, opened and cleaned it. Seems tight now but considering the effort to replace it I'll better install the new one.
Mountain brackets in theory could be simply swapped if one wants, I preferred to re-worked the new one using some sheet aluminum and pop rivets. So the OEM goes to the shelf.
Hope it'll fit as the OEM one stands a bit higher, though.
Ah, and the socket has to be modified slightly (left is the new one, the little tab separating the contacts has to be cut out).
The unit itself seems a 1:1 replacement with identical body and shape.
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