They may have similar or universal parts. I scoured the Internet and found a business address for “Probilt of Tennessee” Address: 3015 John Sevier Hwy. S.E. Knoxville, Tennessee 37914, USA (865)-522-0600
Then I googled that phone number and came up with Jeld-Wen Mill works.
They are one of the largest manufacturers of Windows and Doors and maybe they purchased Probilt.
I would contact them:
800-535-3936 (800-JELD-WEN)
Monday – Friday, 6am – 5pm PST or
http://www.jeld-wen.com/about/contact.cfm
Good Luck.
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