Where to find hydroboost replacement?

[cam.man67]

My mechanic tested my brakes for me and found the hydroboost to the culprit to my intermittent pedal travel issues. Problem is, he say that he can't find a replacement HB for my truck. Evidently since it was an 350 diesel originally, the fittings are flared rather than sealed (or vice versa, I forget).

Anyways, long story short, does anybody know where I might be able to pick up one of these? I could have this rebuilt I guess, but I'll have to wait until spring til it's not my only driver.