Are these Televue tube rings the previous model (USD $209) MRS-4000
http://telescopes.net/store/mrs-4000...-dia-tube.html
or a set of the current model (USD$240) MRS-4011
http://www.skiesunlimited.com/TeleVu...et-4-inch.html
From what I can gather the current model also features an adjustable Vixen bar which will also fit their Telepod mount heads.