Hmmm...I'm not seeing the rectangular wood case on their site anymore, but that's what I got for my The Martin Tenor. It's the bell keys and guard on the left side that does you in with some of them. I'm not familiar with the horn you mentioned, but if it has Selmer-style RH bell keys it'll work in the XL. Guys were saying in the past that they got Martins and such into the regular contoured case, but mine was not a good fit. I use the regular contoured case for a Selmer USA or MK VI, and I also have one of those contoured SKB hardside cases with dark red interior that fits the MK VI like it was made for it. It's a nice gig or travel case, but so's the Pro Tec.