Are you wanting to R154 swap your is300, this is a great video to get started. I list everything that you need to swap, as well as where to get them from. Sorry for the lack of video quality, I am at my school and really wanted to get a video out to you.
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Parts from video:
R154: Can be sourced from facebook Marketplace/ any other market place or Driftmotion
https://www.driftmotion.com/New-R154-Transmission-p/dm3513.htm
R154 MC Rebuild:
https://www.driftmotion.com/product-p/dm3045.htm
Drive Shaft:
https://www.tf-works.com/driveshaft-shop-toyota-is300-1998-2005-with-r154-trans-conversion-1-piece-steel-driveshaft/
or Excessive
https://www.xcessivemanufacturing.com/is300-drivelines.html
Trans Crossmember:
https://www.ebay.com/itm/IS300-GS300-to-R154-Transmission-Cross-Member-WITH-MOUNT/133514471365?hash=item1f161527c5:g:E8gAAOSwnZReldiw
Crossmember Creator:
insta @1jayzed
Poly Mount:
https://www.xcessivemanufacturing.com/urethane-trans-mounts.html
Clutch Kit:
Stage 1 *I did track days on this with ge*:
https://www.driftmotion.com/Stage-1-Clutch-Kit-for-R154-p/dm42.htm
Stage 4 *I'm listing this incase you want to turbo and track*(Drift/track):
https://www.driftmotion.com/Driftmotion-Stage-4-R154-6-Puck-Clutch-Kit-p/dm2040.htm
Flywheel:
Normal weight (Can find on facebook groups):
https://www.driftmotion.com/1JZ-GTE-Driftmotion-Flywheel-19-5lb-for-R154-JZ-p/dm3066.htm
Lightened:
https://www.driftmotion.com/Driftmotion-1JZ-Lightweight-Flywheel-for-R154-p/dm3333.htm
Clutch pedal w/ Master:
https://www.xcessivemanufacturing.com/t-jce10-cpm.html
Cube Speed Shifter:
https://www.ebay.com/itm/CUBE-Speed-Supra-short-shifter-suit-Toyota-Supra-W50-W55-W57-W58-R154-78-2002-/321567946549
*Rebuild if you need one*:
Find local shop
Slave cylinder:
https://www.driftmotion.com/Clutch-Slave-Cylinder-R154-p/dm44.htm
Clutch Line:
https://www.driftmotion.com/ProductDetails.asp?ProductCode=DM53
Clutch Fork:
https://www.driftmotion.com/Clutch-Fork-R154-p/dm2650.htm
Trans Fluid:
https://www.amazon.com/Red-Line-50205-75W80-GL-4/dp/B002INJ69I/ref=sr_1_5?dchild=1&keywords=redline+mt90&qid=1612910826&sr=8-5
Clutch fluid:
Autozone/O'Riellys
Pilot Bearing:
https://www.driftmotion.com/ProductDetails.asp?ProductCode=DM293
Pressure plate Bolts:
https://www.driftmotion.com/Driftmotion-ARP-R154-Pressure-Plate-Bolt-Set-p/dm3406.htm
Flywheel Bolts:
https://www.driftmotion.com/ARP-1JZ-2JZ-Flywheel-Bolts-p/dm153.htm
If I am missing anything, or you need help message me here or on Instagram and I would be happy to help you :D
Social Media:
Instagram: 1j_Hugi