TrueCrypt Forgotten Password

I finally got around to encrypting my USB this past Christmas, but since I also got a new computer I haven't used it in some time, and thus forgot the password. I'm 98% sure I know the first 10 digits and last 10 digits of the password (which are the same), so it's just the middle 2 or 4 digits (I'm about 95% sure it's 4 digits (or shift+digit)). Also, I think the middle 4 digits/shift+digits are just the same 2 digits/shift+digits doubled. So it's something along the lines of abcdefghij7474abcdefghij The middle part could potentially be palindromic also. Is this enough to reasonably go off with some cracking technique, or am I out of luck?

Running 64bit win7. Thanks.

edit: TrueCrypt was set up on my old laptop, running 32bit XP if that makes a difference.