Not sure which Technics rubber mat I had with my SP10mk2, but also stunk. Every mat I tried instead was an improvement. I tried also the suggested modest priced mats I could borrow or buy including Herbie's Way Excellent II Turntable Mat, Funk Firm Achromat, the Boston Audio mat(mostly acrylic) which is the plastic one with the black raised dots that actually lifts the LP off the platter, a couple of spongy, vinylish ones that I don't recall brand and ultimately the copper and stainless steel mats that were head and shoulders the best on my table. I tried them all with 5 or 6 different center clamps & weights ranging hugely in design from the light & affordable Michelle to the heavy & pricey Stillpoints. For my money a $200 custom made 4kg SS 8mm thick mat and an old Micro Seiki center weight were the way to go.
For the price the Herbie's mat was excellent, but if you get one be sure to order the proper diameter as there are versions just a bit to wide that interfere w/the lip on the edge of the SP10mk2 platter. Cheers,