There are no studs. Please use it for two-point support. Compatibility is, of course, with the original and 1000 series, but I don't know about others. The stud width is the general 74mm. As shown in the last image, the block seems to be 32mm. When I actually measured it, it was about 3cm. When I purchased it used, the spring assembly also came with it. It is said to be genuine. It didn't fit the size of my guitar, so I didn't end up using it. I'm not familiar with this, and I bought it by mistake. I did a function check with the arm insertion, each part, and a wrench. I don't know anything beyond that. Those who know more, please make use of it. The original, 1000, and Special models have the same basic size, but I cannot take responsibility, so please check by searching the web yourself. Negotiations and reservations are not accepted. Thank you. Keywords: Floyd Rose Special Color...Black系 (Black-based) Type...Soloist/Dinky type