Vortex Sound Research

Hi all, when I bought my DX7 mkI online, I didn't realize the right plastic cap was cracked. Now I'm starting to look into selling my DX7, I'm hoping to get it fixed. I've been stalking the Syntaur website for about five years since I got my DX7, but they have been out of stock the entire time. If anyone has a spare they could sell me, or even some ebay or etsy link, that would be very appreciated. I've been wanting to get this fixed since I got it and it's even worse now that I am trying to sell it.