DEI 450R, 450T and Viper 690XV

I own a Viper 690XV security system installed into my car. No, I'd like to add some more channels to my system and don't know, which of the two products is the right for me:

450R ?

450T ?

Can anyone explain the difference?

All I found until now is, that both products can be added to any Viper car security system with 4-button transmitters. One dealer told me, that 450R would not be compatible to my Viper 690; another dealer told me, it would....

Might be, anyone of you could even send me an installation guide for the 450R so that I can have a look at it before buying the false module.

Thanks for your info!

Today I received a mail from a directed-employee, telling me that for my Viper 690XV only the 450T will work. The 450R has a separate receiver built into it; this would not comply to my car alarm system which has its own receiver...!???

So, you see, one question and three answers

A 450R installation manual would be highly welcome!! Can anyone provide a copy?

@78musicman

...can you? (copy the manual before selling the device)?

Thx again