i have a harness bar that bolts onto where your seatbelt does, on the sides right under the back window. Im actually probably going to sell it pretty soon, but it was very solid and probably the best place i could find for it
If my internet was working at home id show some pics of the location and such but its not, and i dont have them here at work

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93 del sol-wrecked, repeair, demoted to DD, sold
95 hatch turbo proj-stolen, recovered, sold motor/turbo build, DD now
MK2 MR2 SOLD