I am about to order a Russell Day Long Saddle with a built in Rider backrest.
It is going to cost ~$700 shipping included in all vinyl. You can get leather or velour inserts or all leather for additional costs.
www.day-long.com
They do not have the Tiger listed but I have talked to them on the phone and they do rebuild tiger seats.
You have to send your seat to them and it may take as long as 6 weeks to get it back.