I’m sure that they will be decent for that money and mx5parts do have a good reputation. For probably no more money though, you could get the seat covers plus gear and handbrake gaiters plus doorcards all fitted for you by seat surgeons in York. I’m on my second set now. Albeit for my mk3’s but same quality. That’s assuming you got the whole set from mx5Parts. You also can specify many different quilted or plain styles, colour and style of stitching, colour combos from a wide range of colours, logo’s embroidered in to headrests etc. Might be worth a look? I’m just a highly satisfied customer and have no affiliation.
Here’s mine for an idea.
Barrie