I am going this route in my escort cosworth track car. Its been a long term project so far, i have all the bits ready to go, i have had them for a few years, they are with a really patient guy in the UK. due to me being lazy and now covid. it is still taking time to get a courier to pick up the bits for me i an going to get my arse in gear soon and get them over to me, the reason i went GTR box was here in OZ they are quite easy to get, however the price has skyrocketed in the last few years. Lucky i have some spares.