Received today a DUR-Line +Ultra Quad LNB and it is a PLL with RT350.
The Crystal is on the TOP side with 25MHz.
Horn diameter: 52,5mm with plastic
Mounting dia: 40mm
The cover is 4mm deep , enough space for parts
Also received the QUATTRO Version which is a PLL too!
Edit: Forgot Cover pics
Edit 2: inserted pic Quattro inside