This is a specially made Lambretta base gasket with the correct stud spacings for the small block lambretta engine casing to fit 125 / 150 / 175 / 185 / 195 top end barrels. These have been checked to make sure they are correct. Big surface area around ports for porting. Essential you get the correct base and head gaskets for setting correct port timings and squish height.
These are available in 0.5mm, 1.0mm, 1.5mm and 2.0mm
 
2.5mm, 3mm, 4mm and 5mm are also available
 
Price includes VAT @ 20%