Yes - the T10 Wedge Base LED bulbs replaces OEM bulb types 912 or 921 wedge base bulb in an RV. Here's the whole list: 158, 161, 192, 194, 168, 579, 904, 906, 912, 918, 916, 920, 921, 922, 2821, 2825, 12256, and 12961.
The size is W2.1 x 9.5d.
Many of the sites will list the base type and what they replace.
There is a wide range of prices in LED. I just ordered bulbs from three Ebay sources (search SMD 36-LED Interior Room Dome Door Car Lights). These come in a Bright White and a Warm White, which is closer in color to the incans. The prices are all close at around $3.50-$5.00 per light with shipping. Some look more expensive but include the shipping.
I am also considering trying out the Revolution wedge, which is quite a bit more expensive ($19-$29 per light).
DW, 3 Kids and our Goldens
2012 Shamrock 233S
2008 Toyota Sequoia 5.7L 4WD