Ya al i was looking at them today, have an email gone to scoobyworld about them.
I have a driver side bride type ro that came with the prodrive seats, the sparco side mounts are wielded to the slider and the slider and frame are one.
I was looking to do the same with the passenger side, but il be three months waiting for the passenger bride rail from rallysport direct and have a bit of modifying after i get it. And its £250
Id have to get two of them buddy clubs (want to keep eveything matching) @£150 eash plus postage, And id dont like there side mounts but if i could use the sparco mounts with the buddyclubs. Looks like id only have to drill holes in the sparco mounts.
Or just get one sparco subframe and slider for £105 and see if the height and look is the same as what i have.
All day trying to figure it out.