Bogen 22a Filter Drawer, 6x6 Negative Carrier?

In early January, I won a Bogen 22a Special Enlarger on eBay for a reasonable price of $13 (shipping, however, was not so reasonable). After a hellish experience with an awful seller, I received said enlarger a month later.
Upon unpacking and putting the enlarger together, I have found that there is no filter drawer. Besides the downside of not having a place to put my contrast filters, there is a huge light-spewing hole in my enlarger.
I am wondering a few things:

1) If anyone might know where I would be able to find a filter drawer to fit a Bogen 22a Special (I have already checked eBay, and continue to check daily, I am looking for other recommendations)?
2) If anyone here might have one they are willing to sell?
3) If anyone has any suggestions for what I can do in the meantime to use my enlarger without a filter drawer? I am thinking some heavy layers of black tape would do - any reason this might be a bad idea?
4) On a less important note - if anyone knows where I might be able to find a 6x6 negative carrier for the Bogen 22a (I already have an 80mm lens) or has one that they are willing to sell?

Any help is much appreciated! Thanks!

 

Thanks for the reply - just wondering, if I seal off the slot, is there any reason I couldn't use my contrast filters in the negative carrier with the negative? Will doing this create a different effect than intended?
(Sorry if this is a dumb question - I've never not had a place to put my contrast filters before.)

 

Thanks ann and mike c, it does seem that I have a filter holder under the lens, however I've never worked with filters below the lens before... Does it make any difference that the filters I bought were labelled "above the lens"? They're just 3x3" gel squares from Ilford. Thanks again for the help.