How do I write this Linq-to-Entities Query in Vb.net?

Question

This is what my entities look like:

I'm essentially trying to make a left outer join between LookupMakeModel and LookYearMakeModel for a given year. I plan on selecting a valid year from a dropdownlist and then showing a table of all the records in LookMakeModel and checking the checkbox for the LookMakeModels that have a record in LookYearMakeModel for the given year.

Data Sample:

 ____________________________       __________________________________
|       LookupMakeModel     |       |       LookupYearMakeModel       |    
|----------------------------       |---------------------------------
|Make  |   Model  | Submodel|       |Year |Make  |   Model  | Submodel|
|----------------------------       |----------------------------------
|Ford  |  Mustang | 5.0     |       |2010 | Ford |   Mustang|5.0      |
|Ford  |  Mustang | 4.0     |       |2010 | Ford |   Mustang| 4.0     |
|Ford  |  Explorer| 2wd     |        _________________________________
|Ford  |  Explorer| 4wd     |
____________________________



Query Result for the year 2010 would be like this:

|-----------------------------------
|YearChecked|Make  |   Model  | Submodel|
|------------------------------------
|Yes        |Ford  |  Mustang | 5.0     |
|Yes        |Ford  |  Mustang | 4.0     |
|No/Null    |Ford  |  Explorer| 2wd     |
|No/Null    |Ford  |  Explorer| 4wd     |
_____________________________________

Here's what I have so far:

Dim SelectedYear = ddlYear.SelectedValue
Dim Query2 = From p In gDataContext.LookupMakeModels
Select New With _
{
.Make = p.Make,
.Model = p.Model,
.Submodel = p.Submodel,
.YearChecked = ????? }

Thanks for your help!