Just looking at the differences between the early and later cars it seems some attempts were made to remedy the problems. The later cars have the various fillets welded the strengthen the chassis and most, but not all have the shock tower supports that are riveted to the body sides. Additionally the ladder assembly between the shock towers is wider and the bolt spacing is further apart and a different design. The gearbox support is the same. Also the front setup for the right hand drive cars has a "cam gears" rack, better positioned which appears to have remedied the bump steer issues.
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