Another JIT Slide fan here. Inexpensive and works better than similar offerings from others. Last I checked they were $22 plus shipping from GunnersAlley.
Bit more upscale is the 721OT from Hume.
I've found Don Hume to offer a little better design at a little less expense than the rest. GunnersAlley prices them below factory plus only charges actual shipping.
I've used the Bianchi 55L mentioned uptopic by BlackSheep and it works OK. Pretty much limited to 1" belts and it flops around a bit unless you cinch up tight. The retention snap does work OK tho it can get loose after a while; just reform it or add a thin piece of leather to the inside of the strap. Less of a problem when you only have one Centennial, as the different models vary slightly.
Hope this helps a bit.
Regards,
Pat