Universal Motorhome Seat Swivel Turntable Campervan Chassis Modification This turntable seat has a space to rotate. Generally, according to the screw position of the seat, re-drilling or welding installation, or adding a steel plate transition plate A New Design in Swivel bases Wider and thicker than other universal Seat swivels, allowing for more compatibility and a sturdier fit! - Dimension: 36cm x 39cm - Height/Depth: 40mm - Locks in position at 90 degree intervals - Construction: Powdercoated Steel (please see Images for detailed diagram of dimensions ad hole positions) Can be modified or worked with to fit a Huge variety of Vans! (Not suitable for double bench seats) As a universal swivel seat base, it is designed to be compatible with a large variety of vans; however this does not mean it is compatible straight out of the box, Buyers will need to fabricate their own holes/brackets etc in the correct place so that it aligns up with the bolts and brackets on the base of your seat. We have tried our best to supply as much information about the swivel base design including all dimensions, and a detailed diagram of the base, and where all its current holes and fittings are. It should be fitted by an experienced person and it is the buyers responsibility to take measurements of their van/seat base and ensure that this is the seat base best suited for them. We cannot accept returns on half modified seat bases. If you need any more information feel free to send us a message and we will gladly help.