Got a picture? If it's the corner shower with the pan as one piece and the wall panel as another, that is a really easy replacement. I personally, would replace the whole shower surround, or plastic wall panel. Usually once the shower door is off, it's just plastic rivets, cut the sealant if there is any, remove the faucet and out it will come. Very flexible stuff. Can't remember the brand names, but CC should be able to tell you if you call with you VIN.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.