Posting here after having searched for an answer myself, and this may help others (who google or search engine) as I have now solved the issue in my opinion. I acknowledge the various extensive conversations about what is and isn’t safe or suitable, and it’s not my place to make a recommendation. I am just stating the solution I chose to use. In October 2025, I purchased and installed a: Maxi-Cosi Tanza i-Size, High Back Booster Seat, 3.5–12 years, 100–150cm, Compact Foldable Car Seat, 10 Headrest Positions, G-CELL Side Impact Protection, Padded & Elevated Kids Car Seat, Full Black This fits snugly in the carbon bucket. I have chosen to raise the electric seat to its highest position, and my 5-year-old can see well and sit comfortably. The seat belt loops through the non-ISOFIX tethers neatly (again in my opinion). This is a niche car and a niche question about it, but I spent a lot of time searching and had to return two other car seats to get this solution. If this saves one person the hassle, then it’s worth the post. Once again, I am not validating the legality of this solution but I am pleased and comfortable with the outcome. Thanks to all who post useful information for others to benefit from as I so often do. Cheers Ross
Discussion summary
YOUR RESEARCHPorsche GT4 RS Childs Booster Seat (5 year old)
1 matching discussions were examined; no attributable action/outcome evidence was detected. No consensus or repair conclusion is claimed.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Read captured repliesInsufficient extracted evidence does not mean there is no answer in the original discussions.
1 matching discussions · 1 captured posts examined · 1 partial discussions
Coverage and how to read this overview
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
0 eligible posts · 1 unverified posts · 1 discussions match the subject in their title or opening post.
- PistonHeads: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T172408Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
This is a source reference. Confirm exact model applicability in the original material.