just type Pimax 5k in search
Edit : now its here 
Other headsets also can try this json lines below which give you extra distance sharpness.
Try it - its almost as sharp as original AC ( a bit better than my PC2) Tryied full race Nurburging with 30 cars in rain - stable 45/90 frames. No AA is only the option to get full sharpness and some other modification in json.
Set PT 1.0 , normal FOV with smart smoothing on and FFR on ( conservative) or if dont have RTX just skip FFR
SteamVR SS -130 % ( or if you dont want or dont have FFR set 120%)
If you hot laping/single player only you can use steam vr @140~150 %
Copy lines below and replace in file : menuSettings.json ( documents/ ACC/Config
lines to replace are at the end of json file. ( backup first)
“graphicOptions”:
{
“lastLoadedPresetName”: “”,
“resolution”:
{
“x”: 2560,
“y”: 1440
},
“useFullscreen”: false,
“useTripleScreen”: false,
“hmdWorldToMeters”: 100,
“useHDROutput”: false,
“fpsCapUI”: true,
“mirrorQualityLevel”: 1,
“maxCarsVisible”: 16,
“isMBlurEnabled”: 0,
“motionBlurLevel”: 1,
“isAATemporal”: false,
“aACustom”: 0,
“colorSaturation”: 1,
“sharpen”: 1.5999999523162842,
“pixelDensity”: 1,
“hDROverride”: 0,
“hDROutputDevice”: 5,
“hDRColorGamut”: 2,
“hDRUICompositeMode”: 1,
“hDRUILevel”: 1,
“hDRImageContrastOffset”: 0.20000000298023224,
“hDRExposureGainOffset”: 0.34999999403953552,
“mirrorDistance”: 2000,
“advancedSharpenFilter”: true,
“materialsQuality”: 2,
“temporalUpsampling”: false,
“volumetricFog”: 0,
“bloomLevel”: 0.10000000149011612,
“bloomQuality”: 3,
“mirrorsResolution”: 0,
“cameraDirtLevel”: 2.2000000476837158,
“foliageLodQuality”: 0.30000001192092896,
“whiteBalance”: 9300,
“carLODSet”: 50,
“hLODEnabled”: false,
“colorScheme”: 1,
“imageExposureGain”: 0.5,
“imageContrast”: 0.5,
“useTriplePP”: true,
“useLegacyTonemapper”: false,
“shadowDistanceQuality”: 2,
“gfxPreset”: 4
},
“customGraphicOptions”:
{
“resolutionQuality”: 100,
“viewDistanceQuality”: 1,
“antiAliasingQuality”: 0,
“shadowQuality”: 0,
“postProcessQuality”: 1,
“textureQuality”: 2,
“effectsQuality”: 1,
“foliageQuality”: 2,
“mirrorQualityLevel”: 1,
“maxCarsVisible”: 16,
“isAATemporal”: false,
“aACustom”: 0,
“pixelDensity”: 1,
“mirrorDistance”: 2000,
“advancedSharpenFilter”: true,
“materialsQuality”: 2,
“temporalUpsampling”: false,
“volumetricFog”: 0,
“bloomLevel”: 0.10000000149011612,
“bloomQuality”: 3,
“mirrorsResolution”: 0,
“foliageLodQuality”: 0.30000001192092896,
“carLODSet”: 50,
“hLODEnabled”: false,
“shadowDistanceQuality”: 2,
“frameLimit”: 0,
“isMBlurEnabled”: 0,
“colorSaturation”: 1,
“sharpen”: 1.5999999523162842,
“cameraDirtLevel”: 2.2000000476837158,
“whiteBalance”: 9300,
“imageExposureGain”: 0.5,
“imageContrast”: 0.5,
“hmdWorldToMeters”: 100,
“fpsCapUI”: true,
“useLegacyTonemapper”: false,
“hDRColorGamut”: 2,
“hDRUILevel”: 1
},
“customDriverInfoNames”: []
}