Rhp size and from who?

[CALM Pythons]

I kinda looked around and really can't find info. For AP cages who do you get the RHP's from?
How does it get sent there to install and what size for a T10?
AP website doesn't have the RHP for sale. I'm so confused by all that stuff.
I bought the UTH for it. 11x22 for those that are wondering exact size lol. Well I got the ultratherm with is 11x23.

What temp is your house at Night during Winter?
That helps decide and thats why Bob doesn't list eveything. He custom makes them for the size enclosure too. He is making a small sized 50 watt now for a 36"x12"x12" enclosure. He will ask you a list of questions and then tell you what one you need, the cost, and total shipped. A 88 watt which is bigger than you need for a T10 is $130 shipped.
I myself only use Pro Panels.