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The BT35 F3 had a 13 gallon tank (the same as the Atlantic and FB versions), whereas the BT28 had an 11 gallon tank. The BT29 FB had 15 gallon tanks. The rationalisation of fuel tank sizes may be responsible for the apparent increased girth of the 1600cc car.
The deformable structures (which I don't think were ever made compulsory in F3) were filled with polyeurethane foam.
Fuel bags became compulsory in F1 in 1970 (if they hadn't, Ken Tyrrell might have run the Matra MS80 for another season). I should think they became compulsory in F3 in '73 or '74 (maybe 1974, when the formula changed to 2 Litres)
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