If you have the ability to weld aluminum, don’t waste your money on the kit. The circle patterns for a Toyota Celica and the TR6 are surprisingly close to the same. I used a donor TR6 transmission housing cutting out the starter mount and a section to weld in where the Toyota starter was removed.
I used the steel plate center hole of the engine mount as a fixture to weld the Triumph parts to the Toyota bell housing. I made a bushing centering the Toyota transmission input shaft with the engine mounting plate. It is amazing how close the bolt mounting holes are located between the two transmission bell housings.
You will have to fabricate a rear mounting bracket, rear yoke, shift lever, clutch disk, pilot bearing, throw out bearing, and speedometer cable. I can provide details if interested.
I completed the conversion about five years ago and have driven over 10,000 miles. This includes several trips from Spartanburg, SC to Charleston, SC and Savannah, GA. In fifth gear I can cruse at 70 mph tacking between 2000 and 2500 rpm.
The conversion is well worth the time to fabricate the parts. My conversion is not one way. I can re-install the TR6 transmission easily in one afternoon.
Don’t use the Toyota close ratio transmission. The shift points are too close for the differential ratio.