The trunk has been modified to accept either the long range homologated reservoir (75 l may be) but more likely a second one, hence two filler caps.
Actual roll cages are much better, joining the two top suspension mountings and the floor. Mine is like yours, but full steel of course, and the rear part of the body is rather weak. If tubes are running through the bulkhead, any attachement must be not closer than 10 centimeters from the front strut mounting.Well, should not.
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