Rotas pan connector

[fgbailhache]

Help! I'm trying to install a two piece rotas pan but can't find a pan connector to fit the spigot. MacAlpine and multiquicks range of pan connectors have a tolerance between 108mm and 114mm but the spigot on the rotas pan is 120mm! I've contacted the supplier of the pan but no help there, they've never encountered this problem as they have only ever supplied this product to people connecting into existing cast iron stack pipes.
Can anybody help?

 

[WHPES]

I think the floplast ones have larger apertures than the McAlpine ones. Worth a go.