They're all interchangable. AFAIK Impul speedo is the only one apart from Nismo which is still available new though there was tonnes available when the cars were new. Impul 300km/h, Nismo 320km/h/11k tach, Nismo 300km/h, Nismo 240 with LCD display, Mines, Blitz, Veilside, Club Lemans GT-R, King GT-R(3 or 4 different fonts avail), Do Luck, Damsel(block letters and script letters), RS Yamamoto all did 320km/h. Veilside also did 340 and 360km/h speedos. and that's just off the top of my head, there's even more than that.