thanks CJM, That is a real shame, further digging into the 2017 GT handbook gives the go ahead to spend it like Beckham.
From the handbook, it adds explanation further details of whats allowed in addition / as a replacement to the stock chassis (basically - anything goes!) however its not reflected in the rules only handbook.
Cars may be fitted with additional parts not supplied in the rolling chassis kit (see GT12
Construction Rules 6.7 and 6.7.1) including a differential in the rear axle, replacements for other parts and home-made parts.
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