a simple basic upgrade would be a late mk 1 or mk 2 recaro, then probably something from a VR6, but that'll start being costly. All these will 'fit' reasonably easy (either straight in, or with minor modifications) if you start going mk 4/5, you'll have to start with custom seat rails etc, and for all the effort you may as well have just gone a proper bucket.
So yea, mk 1 or 2 recaro's are quick and easy, and should be reasonably cheap.
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