how do I find the model kohler shower faucet I have

I googled Kohler, found a number to call and spoke to the most useful customer service rep ever. She asked that I take a picture of my shower faucet and send it to her. She identified the model for me. BTW, I installed this replacement valve and it was a piece of cake. The only issue I ran into was installing the balancing valve upside down so the hot and cold were reversed (there are no markings to provide guidance). Easy fix but annoying.

Do these two units come with all necessary o-rings?

It does- there is only 1 I believe

Does this come with the two spring seal/seats? Can I buy just those somewher?

I remember it having a couple of seals. But they weren't spring seals. Maybe go to Lowes or Home Depot. I saw some seals there one time.

Very difficult to find compatiblity of parts. i have the devonshire shower assembly part # k-t397-4-cp . is this valve universal/fit my shower?

I can't say whether the part will fit your model. However, I emailed Kohler customer support, told them my model, and they told me what the correct part was. When I got it, it took less than 10 minutes to install. What helped was checking out beforehand a couple of YouTube videos that others had made. Then when I started, it was like I had done it before, thanks to the videos.

Material	Plastic
Brand	Kohler
Item dimensions L x W x H	6.3 x 3.9 x 2.6 inches
Exterior Finish	painted
Inlet Connection Type	Flange
Outlet Connection Type	Flange
Number of Ports	1
Outlet Connection Size	1.5 Inches
Global Trade Identification Number	00650531688316
Manufacturer	Kohler
UPC	650531688316 065053168831
Part Number	GP76851
Item Weight	8.2 ounces
Product Dimensions	6.3 x 3.9 x 2.6 inches
Item model number	GP76851
Is Discontinued By Manufacturer	No
Size	2.60 x 3.90 x 6.30 inches
Thickness	1 Inches
Item Package Quantity	1
Measurement System	US
Included Components	GP876851 GP76851
Batteries Included?	No
Batteries Required?	No

GP76851 Repair Kit for Single-Handle Pressure Balance Valve

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