Fitting Corbeau RRB seats

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After several months of messing about with a supplier I now have a set of Corbeau RRB seats in the car - they fit...just (both me and the car!), and are far more supportive than the stock seat.

However....the adaptor plates the came with (bottom mounted rails) mean that the seat is about an inch higher than the stock one in the car, so I dont fit with a helmet on with any degree of comfort, and I dont like the higher driving position either.

What are my options for ditching the adaptor plates, can one of the specialists make up custom rails or brackets that will do the job?

[suba]

Anyone?