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I replaced the bulbs in my 81 R100RT with LEDs from this company. You may have to pull the original bulbs and compare them to what's in their inventory. They list the dimensions, wattage, lumens etc. for each bulb. I found the replacements to be "plug and play" they also offer different colors in addition to white. Also you might want to contact Kat Dash who has developed a new circuit board with all LEDs for the instrument cluster.
She can be contacted at: KATDASH Airhead Instrument Lighting
www.katdash.com