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Check the Ebay. There are a vendors who sell replica GT3 bumpers for non-GT3 cars. This one (https://www.ebay.com/itm/18490749171...mis&media=COPY) is offered by Xtreme Motor Cars (no affiliation). Based on the photos from their site, the fit looks pretty good but I think any aftermarket solution will require custom modification to get the optimal fit. Good luck!
As Pete (Petza914) says, Misha Designs went out of business some years ago and it's a shame because they did make some very mice looking body mods... well at least to my liking that is.
Anyway, I was fortunate enough to get their GT2M wing for for my 997.2 before they went under. And although it did require quite a bit of "coaxing" to get it to fit the where the factory spoiler goes, I ultimately feel
that it was worth it.