L4240 expansion plug size?

[dfixit1]

Thinking of installing a block heater but need to know the expansion plug size. Unfortunately the parts breakdown only gives a part number 15221-03380
Anyone know what size it is?
Thanks.

Edit: found it 32mm

 

[North Idaho Wolfman]

Thinking of installing a block heater but need to know the expansion plug size. Unfortunately the parts breakdown only gives a part number 15221-03380
Anyone know what size it is?
Thanks.

Edit: found it 32mm

You'll need the sleeved type as there is not enough room in there for the normal heater element to fit.