taitotz.cpp: batlgr2a
is the Side by Side cabinet revision + other stuff
#13691
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Pointed out on a /r/MAME comment: https://www.reddit.com/r/MAME/comments/1iyalur/mame_0275/methugu/

Info about Side by Side cabinet versions of Battle Gear games from mokonaXVI (Japanese)
This will also need some input rework because the Side by Side cabinet versions of Battle Gear 1 and 2 merges the functionality of view and start button, as that cabinet only has the view change button (Battle Gear cabinets have seperate start, view, and blinker buttons).
EDIT: While at it, I've also:
batlgear
year to 1999 - official website archive and a magazine article (direct link) confirm release date of March 1999.