Seat for a 1957 G3LC/G3LCT trials machine

[Gary Fleshman-Kubodera.]

Does anyone know or have a twin seat or photos of one for a 57 G3LC/G3LCT trials machine? I am having a problem finding someone that is familliar with the seat. I have put in an order for a twin seat for my Competition machine through Wallridge but it seems as if it is a mystery as to what is is suppose to look like along with the mounting studs to fit the bike. Looking at my spares list, it seems as if the seat uses the same studs, nuts and mounts as the road going heavyweights? Can anyone out there help!?

Thanks Gary Kubodera USA