I have the Rb20det Blue Mckinney Mount kit(poly engine/trans mounts) Brand new
It is for the Rb20 into s13 or s14, if you check the Mckinney Motorsports site there is a picture.
Mckinney sells a mount kit especially for the rb25 swaps, if you call them they may be able to tell you if it will work, however visualy they don’t look the same…
Also the rb25 mount kit they sell is $115 more…