I blew up that same elbow in the IC piping in my own '87 sometime in 2003 or 2004. Same fracture and material/adhesive failure, and the part's unique to early 7M-GTE MA70's, my '88 and all my later 7M-GTE Supras had a revised IC pipe section there.
I got by just doing the Home Depot Motorsports method using some plumbing parts. I brought the broken part in and compared OD/ID as needed and mixed a few parts together in a way that worked. But for $50 plus shipping I'd bet on Z06GETTE's option being better overall.