Found your tank:
viewtopic.php?f=27&t=16445&p=184242&hilit=graham#p184242If you fab mounts, no need for the tray except a little aero and if you want to catch mud/salt off the tires.
Not much room under the tank for fittings that could easily be ripped off. I guess you meant on the lower leading edge? Are you switching tanks because you intend to run an external pump and don't want to lift fuel to reach it?
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Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS
viewtopic.php?f=5&t=13225&p=134742Simple Spring select
viewtopic.php?f=5&t=11815LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12