In case anyone is reading this older thread for research there is a Sonic's lube tube retainer
On eBay for under $3 shipped right now he has a few of them it's not just a one-off. It's like $2.65 plus tax and free shipping under $3.00 to your door.
Question are any of you all replacing the plate gasket between the accumulator cover and the accumulator housing or are you just using the old one?