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the photo item you sent us(SM25) is out of production. The new product that replaces it is the M25.
if I asked if there was any physical differences between the two items they replied:
the difference is only in the dimension: SM25 -->300x160mm instead M25 --> 283x130mm. So you can install M25 in the old SM.
and when pressed to provide additional information they were unable to although the manufacturers website has the following information provided in it:
Its very often that we encounter hardware thats been manufactured from Europe and while I certainly understand using material that originates from a company outside of the united states we find it easier when tearless specified using material from companies that are located domestically is it makes the long-term ownership of that hardware usually less expensive because were able to rely on technical support that gives us a better set of options when it comes to managing changes in product lines.