MX5Ireland

So I have just fitted a Sparco Sprint V to the driver's side of my car using the original rails (would ideally like it lower...) and now want to fit a matching one to the passenger side. What way have people gone about fitting a bucket seat on the passenger side as the rails are a different distance apart?

I was about to order the JB Fabrication mounts but decided to do a quick search and found that people were having problems using them on passenger side