I suppose the dealer might be your best reference resource to tell what came as standard for that year model, also I'd ask for a complete list of options available at that time. It would also be handy to get a code breakdown to tell you what each number and letter stand for in the Vin. I'd be running a Car Fax also to verify any major collision, flood damage, clean title history etc. Welcome to the Forum and happy wheeling!
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90 4Runner SR5 V6 3.0 The Illness: Downey K&N Intake kit/ISR/Downey Headers/2 1/2" Custom Exhaust/Hi-flo Cat/Spintech Muffler/Flex-a-lite/NWOR 1 1/2" lift Springs & 26mm T-Bars/4.88's/32x11.50R15 A/T's/Aisin manual hubs/Genuine Steel Euro Guard, Step Bumpers & Taillight Guards/Weather Guard Visors & Deflectors/Bushwacker Flares/Stripes removed/TRD Decals/Euro wheelskin.