You could use a pistol to "drill" thru your roof and mount it there. 
I remember my dad doing that to his pickup back in the '70s.
Otherwise, I can't help here...Good luck!
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97' LX450 (WIFE'S) OEM CUPHOLDER, PHH, POWER ANTENNA FIXED & FRONT AXLE REBUILD.
01' TACOMA DBL CAB, LIFT, ARB, ARE SHELL, HI-LIFT, SLIDERS, CUSTOM REAR BUMPER, WINCH, 2" COILOVER SWAY-A-WAYS, GARMIN, ETC.
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